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Here are words similar to on the wane:
a cappella, abandoned, abase, abatement, abating, abbandono, abjuration, abjurement, ablative, abnegation, abridge, abridgment, accrescendo, aching, adagietto, adagio, adoring, adown, affectionate, affettuoso, agilmente, aging, agitato, allaying, allayment, allegretto, allegro, alleviating, alleviation, alternation, amabile, ambling, ambulation, amoroso, analgesia, andante, andantino, anesthesia, anesthetizing, anile, apathetic, appassionatamente, appassionato, appeasement, arrested, aslant, aslantwise, aslope, assuagement, assuaging, at a slant, at rest, atilt, atrophy, attenuation, attrition, back-and-forth, backpacking, backward, bad, barely audible, belittle, below, benumbed, blase, blunting, bored, bowed-down, break, brillante, bump, bust, cachectic, cachexia, cachexy, calm, calming, capriccioso, cascade, cast down, catabasis, cataract, cautious, chastening, chronic ill health, chucking, chucking out, chute, circumspect, claudicant, cloistered, coarse, collapse, collapsing, comedown, coming and going, coming apart, compress, con affetto, con agilita, con agitazione, con amore, conceptually crude, conjugal, contaminated, contempt, contraction, contractive, contradiction, cool, corrupt, corrupted, crabbed, cracking, crash, crawling, creeping, creeping like snail, crescendo, crude, crumbling, curtail, curtailment, cushioning, cut, cut back, cut down, cutting, damp, dampen, dampening, damping, dashed, dead, deadening, debacle, debase, debased, debauched, debilitated, debilitation, debility, decadence, decadent, decaying, deceleration, deciduous, declension, declination, declinature, decline, decline and fall, declined, declining, declivate, declivitous, declivity, declivous, decoagulated, decrease, decreasing, decreasingly, decrement, decrepit, decrepitude, decrescence, decrescendo, decrescent, decry, decurrent, deduct, deduction, deductive, deflate, deflation, defluxion, degeneracy, degenerate, degenerating, degeneration, degenerative, degrade, degraded, dejected, deliberate, delicacy, delicate health, deliquescent, demerit, demonstrative, demote, demulsion, denial, denigrate, depletion, deplume, depose, depraved, depreciate, depreciation, depress, depressed, depression, deprivation, derogation, descendant, descending, descension, descent, desiderium, despaired of, despairing, despisal, despising, despondent, desponding, deteriorating, dethrone, detraction, devalue, devolution, devoted, dilapidated, dim, diminish, diminishing, diminishingly, diminishment, diminuendo, diminution, dimness, dip, dipping, disagreement, disallowance, disapproval, discard, disclaimer, disclamation, discounting, discouraged, disenfranchise, disfranchise, disgrade, disheartened, disintegrating, dismissal, disobedience, disownment, disparage, disparagement, dispirited, displace, displume, dispossess, disregard, dissent, dissipated, dissolute, distant, dive, doddered, doddering, doddery, dolce, done for, dopey, dormant, doting, down, down south, down-reaching, downbend, downcast, downcome, downcoming, downcurve, downfall, downfalling, downflow, downgate, downgoing, downgrade, downhearted, downhill, downline, downplay, downpour, downright, downrush, downsinking, downstairs, downstream, downstreet, downtown, downtrend, downturn, downward, downward trend, downwards, downwith, drained, draining, drawn-out, drooping, droopy, drop, dropping, drugged, dulcification, dull, dulling, dwindling, dying, dying off, ease, easement, easing, easy, ebb, ebb and flow, ebbing, effete, embryonic, ending, enervated, enervation, enfeebled, erosive, even-tenored, ever less, exanimate, exception, exclusion, exhausted, exhaustion, expiring, extended, extenuation, extraction, facing death, fade-out, fading, failing, faineant, faint, faint-voiced, faintness, faithful, fall, falling, falling off, falling-off, faltering, feeble, feebleness, feeling low, filial, flagging, flatness, fluctuation, flux and reflux, fond, foot-dragging, footing, footing it, footwork, forte, fortissimo, fossilized, fragility, fragmenting, frail, frailty, gentle, gentleness, gerontal, gerontic, getting on, given up, going, going on foot, going to pieces, grade, gradient, gradual, gravitation, groggy, growing old, halcyon, half-heard, halting, hang, hanging, hankering, healthless, healthlessness, heartless, heavy, hebetudinous, Heimweh, hiking, hitchhiking, hitching, hobbled, hobbling, holding back, homesick, homesickness, honing, hoofing, hopeless, humble, husbandly, hushed, hushing, hypochondria, hypochondriac, hypochondriacal, hypochondriasis, idle, ignoring, ill health, immoral, impairment, impassive, in articulo mortis, in embryo, in extremis, in low spirits, in ovo, in poor health, in solution, in suspension, in the depths, in the doldrums, in the dumps, in the rough, inanimate, incapable of life, inclination, indistinct, indistinctness, indolent, inert, infirm, infirmity, intellectually childish, interminable, invalid, invalidism, invalidity, isolated, jaded, lackadaisical, lamentabile, languid, languishing, languishment, languorous, lapse, larghetto, larghissimo, largo, lasting, lazy, leaden, legato, leggiero, legwork, leisurely, lengthened, leniency, less, less and less, lessen, lessening, letdown, lethargic, letup, lifeless, lightening, limp, limping, lingering, liquefied, liquescent, Lissajous figure, listless, long, long-continuing, long-drawn, long-drawn-out, long-pending, long-winded, longing, loosening, lovelorn, lovesick, lovesome, loving, low, low-spirited, lower, lowering, lowness, lulling, lumbering, lumpish, mal du pays, maladie du pays, marathon, marcando, marcescent, marching, mark down, maternal, melted, melting, miniaturization, minimize, mitigating, mitigation, moderate, modulation, moldering, mollification, molten, morally polluted, morbidity, morbidness, morendo, moribund, mossbacked, moth-eaten, mummylike, murmured, nay, near death, negation, negative, negative answer, nix, no, nonacceptance, nonapproval, noncompliance, nonconsent, nonconsideration, nonobservance, nonviable, nostalgia, nostalgic, nostomania, numb, numbing, obsolescent, off plumb, on the decline, on the descendant, on the downgrade, on the skids, on the wane, oscillation, overlong, oversimple, pacific, pacification, pale, palliation, palsied, papery-skinned, pare, parental, parlando, passing by, paternal, peaceable, peaceful, peaked, peakedness, peaky, pedestrianism, pendulation, perambulation, perverted, pessimistic, phlegmatic, pianissimo, piano, pining, pizzicato, placid, play down, plummeting, plunge, plunging, poking, poky, polluted, pooped, poor health, pounce, prestissimo, presto, profligate, prolonged, protracted, putting away, putting out, quiescent, quiet, quietening, quieting, rakingly, rallentando, ramshackle, rapids, ravaged with age, rebuff, recantation, receding, reciprocation, reduce, reduced, reduced in health, reducing, reduction, reductionistic, reductive, refusal, regressive, rejection, relaxation, relaxed, relaxing, relief, reluctant, remedy, remission, renouncement, reposeful, reposing, reprobate, repudiation, repulse, restful, resting, retention, retiring, retraction, retreat, retreating, retrench, retrenchment, retrograde, retrogressive, rhythmic play, ricketish, rickety, ritardando, ritenuto, rocky, roll back, romantic, rotten, rough, roughcast, roughhewn, rude, rudimental, rudimentary, run down, run to seed, run-down, rusty, sagging, salving, sated, sauntering, scale down, scaling down, scarcely heard, scherzando, scherzo, scherzoso, scouting, secluded, seesaw, seesawing, self-indulgent, senescent, senile, sentimental, sequestered, sequestrated, setting, shaky, sheltered, shifting, shorten, shortening, shrinkage, shrinking, shriveled, shriveling, shuffling, sickliness, sickly, simplicity, simplify, simplistic, sine wave, sinking, slack, slackening, slantingly, slantways, slantwise, slaunchways, sleepy, sliding, slipping, slipping away, slopeways, slopingly, slothful, slow, slow as death, slow as molasses, slow as slow, slow-crawling, slow-foot, slow-going, slow-legged, slow-moving, slow-paced, slow-poky, slow-running, slow-sailing, slow-stepped, slowdown, sluggish, slump, slumping, smooth, snail-paced, snaillike, soft, soft-sounding, soft-voiced, softening, softness, somnolent, soothing, sordo, sotto voce, spiccato, spidery, spindly, spiritless, spun-out, spurning, staccato, staggering, stagnant, stagnating, steeped in iniquity, step down, still, still as death, stillish, stilly, stoic, stolid, stoop, stretched-out, stretto, stricken in years, strip of rank, strolling, stultified, stunted, subaudibility, subaudible, subdued, subduedness, subduement, subduing, submerging, subsidence, subsiding, subtraction, subtractive, suicidal, supine, swoop, tabetic, tainted, take from, teeter, teeter-totter, teeter-tottering, teetering, teetery, tempering, tender, tentative, terminal, thawed, throwing out, thumbing, thumbing a ride, thumbs-down, timeworn, tipsily, to-and-fro, toddling, torpid, tortoiselike, tottering, tottery, tramping, tranquil, tranquilization, treading, tremolando, tremoloso, trillando, trudging, truncation, tumbledown, tune down, turndown, turning out, turtlelike, unagitated, unblown, unclear, unclearness, unclotted, uncultivated, uncultured, uncut, underdeveloped, undervalue, undeveloped, undisturbed, unfashioned, unfinished, unformed, unhealthiness, unhealthy, unhewn, unhurried, unlabored, unlicked, unmoved, unperturbed, unpolished, unprocessed, unrefined, unruffled, unsound, unsoundness, unsteady, unstirring, untreated, untroubled, unwholesomeness, unwillingness, unworked, unwrought, upgrade, uphill, ups and downs, uxorious, vacillation, valetudinarian, valetudinarianism, valetudinary, variation, vegetable, vegetative, vice-corrupted, vicissitude, vitiated, waddling, walking, wan, wane, waning, warped, wasting, waterfall, wavering, weak, weak-voiced, weakened, weakliness, weakly, weakness, weary, weary of life, wifely, wigwag, wilting, wishful, wistful, with low resistance, withered, withering, withholding, wizened, woebegone, world-weary, worsening, write down, yearnful, yearning,