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Here are words similar to fanatically:
a corps perdu, absurdly, all to pieces, amain, angrily, apace, ardently, at once, by forced marches, carelessly, crazily, cursorily, deliriously, demonically, desperately, destructively, distractedly, doggedly, energetically, enthusiastically, exceedingly, excessively, excitedly, expeditiously, extremely, fanatically, ferociously, fervently, fervidly, feverishly, fiercely, foolishly, forlornly, frantically, frenetically, frenziedly, furiously, glowingly, hand over fist, happen what may, hastily, head over heels, headfirst, headforemost, headlong, heatedly, heedlessly, heels over head, helter-skelter, holus-bolus, hopelessly, hotfoot, hotheadedly, hotly, hurriedly, hurry-scurry, hysterically, idiotically, immediately, impetuously, impossibly, in anger, in hot blood, in passing, inanely, indignantly, infuriatedly, infuriately, insanely, insensately, instantly, intensely, intensively, irately, irrationally, like a flash, like a shot, like a streak, like blazes, like crazy, like fury, like greased lightning, like lightning, like mad, like one possessed, like sin, like sixty, madly, mindlessly, on the run, overeagerly, overenthusiastically, overzealously, passionately, pell-mell, persistently, precipitantly, precipitately, precipitously, promptly, quickly, rabidly, ramble-scramble, rashly, recklessly, ridiculously, rigorously, riotously, senselessly, severely, slam-bang, slap-bang, slapdash, speedily, stormily, stupidly, superficially, swiftly, tempestuously, troublously, turbulently, uncontrollably, uproariously, vehemently, venomously, violently, virulently, wantonly, warmly, wildly, with a rush, with a vengeance, with all haste, with dispatch,