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Here are words similar to lightheartedness:
absentmindedness, absurdity, achroma, achromasia, achromatosis, activity, adaptability, adjustability, aggressive self-confidence, agility, airiness, airy nothing, airy texture, albescence, albinism, albino, albinoism, alterability, AM signal, amiable weakness, amusement, and jump, anemia, animation, appearance, ardor, arrogance, ascent, ashiness, attenuation, audacity, ax, backfire, backlash, backlashing, banter, beam, beat signal, big deal, blips, blondness, bloodlessness, bludgeon, bluff, bluster, bluster and bluff, bob, bobble, bodilessness, bold front, boldness, booing, boomerang, boot, boot out, bounce, bounce back, bounces, bounciness, bound, bound back, brag, brash bearing, brashness, brassiness, bravado, brave show, brazenness, break, breakability, breeziness, brightness, brio, briskness, brittleness, broad jump, browbeat, bubbliness, buck, buckjump, bulldoze, bully, bullyrag, bump, bumptiousness, buoyance, buoyancy, bust, cadaverousness, can, canescence, cannon, cannon off, caper, capriole, caracole, carefreeness, carelessness, carom, cashier, cast, cast out, catcalling, cavort, chaffing, chalkiness, chambering, changeability, changeableness, changefulness, chatter, cheekiness, cheer, cheerfulness, chestiness, chirpiness, chloranemia, chroma, chromatic color, chromaticity, chuck out, clear, cockiness, collapse, color quality, colorimetric quality, conceit, conceitedness, contempt, contemptuousness, contrecoup, cool color, coquettishness, cow, creaminess, CRT spot, curvet, cut a dido, cut capers, daintiness, daring, daringness, deathly hue, deathly pallor, debonairness, defenestrate, defial, defiance, defrock, defying, degrade, delicacy, delusiveness, demivolt, demote, deplume, depose, deprive, derision, despite, destructibility, detrude, diaphanousness, didder, dilutedness, dilution, dimness, direct signal, disbar, discard, discharge, disdain, disemploy, disintegration, dismiss, displace, display, displume, disregard, disregardfulness, distraction, dither, diversion, divertisement, divertissement, DM display, Doppler signal, double-dot display, downiness, draftiness, dragoon, drum out, dullness, dynamism, easy virtue, echo, echo signal, effeminacy, effervescence, eject, elan, elasticity, emptiness, energy, enjoyment, entertainment, enthusiasm, ethereality, exclude, exiguity, exility, expansiveness, expel, exsanguination, extensibility, extrude, exuberance, facetiousness, faddishness, faddism, fadedness, faintness, fairness, fallaciousness, false appearance, false light, false show, falseness, falter, featliness, fickleness, fineness, fire, fleering, flexibility, flightiness, flimsiness, flippancy, floatability, flounce, fluffiness, fluidity, fly back, flying jump, FM signal, foaminess, folly, fooling, foolishness, fragility, frailty, frangibility, frisk, frivolity, frivolousness, frolic, frostiness, frothiness, fun, furlough, futility, gaiety, galliard, gambado, gambol, gasconade, gauziness, gelandesprung, gentleness, get-up-and-go, ghastliness, giddiness, give, give the ax, give the gate, give the hook, gladness, glaucescence, glaucousness, glee, gleefulness, glow, go, gossameriness, gracility, grand jete, grimace, grinning, grizzliness, gustiness, gusto, haggardness, handspring, happiness, have an ague, have repercussions, heave out, hector, heedlessness, high glee, high jump, high spirits, Highland fling, hilariousness, hilarity, hippety-hop, hissing, hoariness, hooting, hop, hue, human frailty, hurdle, hustle, hypochromia, hypochromic anemia, idealization, idleness, IF signal, illusionism, illusionist, illusiveness, IM display, immateriality, immodesty, impalpability, impermanence, impertinence, impetuosity, impetus, imponderability, impudence, inadvertence, inadvertency, inanity, inattention, inattentiveness, inconsideration, inconstancy, incorporeality, incuriosity, indecisiveness, indifference, infirmity of will, inherent vice, inobservance, insolence, insolidity, insubstantiality, intangibility, intimidate, irresolution, jactitate, jar, jauntiness, jeering, jerk, jete, jettison, jig, jigget, jiggle, jocularity, jocundity, jog, joggle, joie de vivre, jolliness, jollity, jolt, joshing, jostle, jounce, joviality, joy, joyfulness, joyousness, jump, jump about, jump over, jump shot, jump turn, jump-hop, jump-off, junk, kick, kick back, kick downstairs, kick out, kick upstairs, kickback, laciness, lack of depth, lack of weight, lactescence, lash back, laughter, lavolta, laxity, lay off, leap, leap over, leapfrog, leering, let go, let out, leukoderma, levitation, levity, life, light heart, lightheartedness, lightmindedness, lightness, lightsomeness, liveliness, lividness, local oscillator signal, long jump, loose morals, looseness, lop, lucence, lucency, lucidity, luminosity, luminousness, lustiness, magic, magic act, magic show, magician, make redundant, malleability, mercuriality, mercurialness, merriment, merriness, merrymaking, mettle, milkiness, mirth, mirthfulness, mistiness, mobility, mockery, modifiability, moral weakness, morris, movability, muddiness, Munsell chroma, mutability, negligence, negotiate, neutral color, nimbleness, nonobservance, nonuniformity, nugacity, obliviousness, obtrude, obtrusiveness, oust, out-herod Herod, output signal, overjump, overleap, overskip, paleness, pallidity, pallidness, pallor, panning, paperiness, passe-temps, pastime, pastiness, peacockery, peacockishness, pearliness, pension off, pep, perkiness, permutability, pertness, picture, pips, plasticity, playfulness, pleasure, pole vault, pounce, pounce on, pounce upon, prance, prankishness, pranksomeness, prestidigitation, prison pallor, promiscuity, Prospero, purity, put out, quake, quaver, quiver, radar signal, radio-frequency amplifier, radio-frequency signal, radio-frequency stage, rage, ragging, raillery, rallying, ramp, rant, rareness, rarity, rave, razzing, read out of, reading, rebound, rebuff, recalcitrate, recalcitration, recoil, recreation, reflected signal, reflection, regalement, regardlessness, reject, rejoicing, relaxation, release, remove, repercuss, repercussion, replace, repulse, resile, resilience, resiliency, responsiveness, retire, return, return signal, revelry, RF amplifier, RF echoes, RF signal, RF stage, ricochet, rictus, ridicule, roasting, robustness, roguishness, roister, rollick, romp, rubberiness, running broad jump, running high jump, sack, sallowness, saturation, sauciness, saut de basque, scoffing, seeming, self-assertiveness, self-conceit, semblance, separate forcibly, shake, shallow-wittedness, shallowness, shiver, shock, shortwave signal, show, shudder, sickliness, sickly hue, side, signal, signal display, silliness, silver, silveriness, simulacrum, ski jump, skip, skittishness, slang, sleaziness, sleeping around, sleight of hand, slenderness, slightness, slimness, smart-aleckiness, smartness, smirking, snap, snap back, sneering, snickering, sniggering, snorting, snowiness, softness, sorcerer, sorcery, specious appearance, spirit, spiritedness, splutter, sportiveness, spot, spring, spring back, springiness, spryness, sputter, start, start aside, start up, steeplechase, storm, stretch, stretchability, stretchiness, strip, strut, strutting, subtility, subtilty, subtlety, superannuate, superficiality, suppleness, surplus, suspend, swagger, swaggering, swank, swash, swashbuckle, swashbucklering, swashbucklery, swashbuckling, swelled head, swelled-headedness, swinging, target image, taunting, tenderness, tenuity, tenuousness, terminate, thinness, thoughtlessness, throw away, throw out, throw overboard, thrust out, tic, tint, tone, tonicity, tonus, toss out, tour jete, trace, transience, translucence, translucency, transmitter signal, tremble, tremor, trickery, trickiness, triflingness, trip, triteness, triviality, trivialization, trivialness, turn off, turn out, twitch, twitter, twitting, unactuality, unalertness, unawareness, unconcreteness, unconsciousness, undependability, unfrock, unheaviness, unheedfulness, unidirectional signal, unintentiveness, unmindfulness, unobservance, unpredictability, unprofoundness, unprofundity, unreality, unreliability, unsolidity, unsubstantiality, unsubstantialness, unwariness, unwatchfulness, updive, upleap, upspring, vacuity, vagueness, value, vanity, vapidity, vapor, vault, velleity, verve, vibrate, video signal, vitality, vitiligo, vivacity, volatility, waggery, waggishness, wanness, wantonness, warm color, warmth, wateriness, waywardness, weakness, weightlessness, white, white race, whiteness, whitishness, whorishness, windiness, wispiness, wobble, yield, zest,