| aimlessly | (adverb) without aim; in an aimless manner | - |
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| artlessly | (adverb) in an ingenuous manner | Synonyms: ingenuously |
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| (adverb) in a crude and unskilled manner | Synonyms: crudely, inexpertly |
| blamelessly | (adverb) in an irreproachable and blameless manner | Synonyms: irreproachably |
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| bloodlessly | (adverb) without bloodshed; in a bloodless manner; without shedding blood | - |
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| boundlessly | (adverb) without bounds | Synonyms: immeasurably, infinitely |
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| breathlessly | (adverb) in a breathless manner | - |
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| carelessly | (adverb) without caution or prudence | Synonyms: incautiously |
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| (adverb) in a rakish manner | Synonyms: raffishly, rakishly |
| (adverb) without care or concern | Synonyms: heedlessly |
| ceaselessly | (adverb) with unflagging resolve | Synonyms: continuously, endlessly, incessantly, unceasingly, unendingly |
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| cheerlessly | (adverb) in an unhappy manner | - |
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| crossly | (adverb) in an ill-natured manner | Synonyms: grouchily, grumpily |
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| dauntlessly | (adverb) without fear | Synonyms: fearlessly, intrepidly |
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| defencelessly | (adverb) without defense | Synonyms: defenceless, defenseless, defenselessly |
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| defenselessly | (adverb) without defense | Synonyms: defenceless, defencelessly, defenseless |
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| doubtlessly | (adverb) without doubt; certainly | Synonyms: doubtless, undoubtedly |
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| effortlessly | (adverb) without effort or apparent effort | - |
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| emotionlessly | (adverb) without emotion; devoid of emotion | Synonyms: unemotionally |
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| endlessly | (adverb) continuing forever without end | Synonyms: infinitely |
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| (adverb) with unflagging resolve | Synonyms: ceaselessly, continuously, incessantly, unceasingly, unendingly |
| (adverb) all the time; seemingly without stopping | Synonyms: interminably |
| (adverb) (spatial sense) seeming to have no bounds | - |
| expressly | (adverb) with specific intentions; for the express purpose | - |
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| faithlessly | (adverb) in a disloyal and faithless manner | Synonyms: false, traitorously, treacherously, treasonably |
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| faultlessly | (adverb) without a fault; in a faultless manner | - |
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| fearlessly | (adverb) without fear | Synonyms: dauntlessly, intrepidly |
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| fecklessly | (adverb) with ineptitude; in an incompetent manner | Synonyms: ineptly |
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| (adverb) in a feckless manner; irresponsibly and incompetently | - |
| flawlessly | (adverb) smoothly and without difficulty; precisely and deftly | Synonyms: cleanly |
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| formlessly | (adverb) in a formless manner | - |
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| fruitlessly | (adverb) in an unproductive manner | Synonyms: unproductively, unprofitably |
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| gainlessly | (adverb) without gain or profit | Synonyms: profitlessly, unprofitably |
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| gracelessly | (adverb) in a graceless manner | - |
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| (adverb) without grace; rigidly | Synonyms: ungracefully, ungraciously, woodenly |
| grossly | (adverb) in a gross manner | - |
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| harmlessly | (adverb) in a harmless manner | - |
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| heartlessly | (adverb) in a heartless manner | - |
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| heedlessly | (adverb) without care or concern | Synonyms: carelessly |
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| helplessly | (adverb) in a helpless manner | Synonyms: impotently |
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| hopelessly | (adverb) without hope; desperate because there seems no possibility of comfort or success | - |
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| (adverb) in a hopeless manner | - |
| (adverb) in a dispirited manner without hope | Synonyms: dispiritedly |
| humorlessly | (adverb) in a humorless manner | Synonyms: humourlessly |
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| humourlessly | (adverb) in a humorless manner | Synonyms: humorlessly |
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| joylessly | (adverb) in a joyless manner; without joy | - |
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| lawlessly | (adverb) in an illegal manner | Synonyms: illegally, illicitly |
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| lifelessly | (adverb) as if dead | Synonyms: deadly |
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| (adverb) without animation or vitality | - |
| (adverb) in a lifeless manner | - |
| listlessly | (adverb) in a listless manner | - |
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| mercilessly | (adverb) without pity; in a merciless manner | Synonyms: pitilessly, remorselessly, unmercifully |
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| mindlessly | (adverb) in an unreasonably senseless manner | Synonyms: senselessly |
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| (adverb) without intellectual involvement | - |
| motionlessly | (adverb) without moving; in a motionless manner | - |
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| needlessly | (adverb) without need | - |
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| nervelessly | (adverb) in a composed and unconcerned manner | Synonyms: coolly, nonchalantly |
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| noiselessly | (adverb) without a sound | Synonyms: soundlessly |
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| painlessly | (adverb) without pain | - |
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| pitilessly | (adverb) without pity; in a merciless manner | Synonyms: mercilessly, remorselessly, unmercifully |
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| pointlessly | (adverb) in a pointless manner | - |
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| powerlessly | (adverb) in a powerless manner | - |
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| profitlessly | (adverb) without gain or profit | Synonyms: gainlessly, unprofitably |
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| purposelessly | (adverb) without a clear purpose | - |
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| recklessly | (adverb) in a reckless manner | - |
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| relentlessly | (adverb) in a relentless manner | Synonyms: unrelentingly |
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| remorselessly | (adverb) without pity; in a merciless manner | Synonyms: mercilessly, pitilessly, unmercifully |
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| restlessly | (adverb) in a restless manner | - |
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| ruthlessly | (adverb) in a ruthless manner | - |
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| selflessly | (adverb) in an altruistic manner | Synonyms: altruistically |
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| senselessly | (adverb) in an unreasonably senseless manner | Synonyms: mindlessly |
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| (adverb) in a meaningless and purposeless manner | - |
| shamelessly | (adverb) without shame | Synonyms: barefacedly, unashamedly |
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| shapelessly | (adverb) in a shapeless manner | - |
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| sleeplessly | (adverb) without sleep; in a sleepless manner | - |
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| soullessly | (adverb) in a soulless manner | - |
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| soundlessly | (adverb) without a sound | Synonyms: noiselessly |
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| speechlessly | (adverb) in a manner indicating that one is deprived of speech by physical weakness or emotion | - |
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| spotlessly | (adverb) in a spotless manner | - |
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| tactlessly | (adverb) without tact; in a tactless manner | - |
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| tastelessly | (adverb) without taste or in poor taste; in a tasteless manner | - |
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| thoughtlessly | (adverb) showing thoughtlessness | - |
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| (adverb) in a thoughtless manner | Synonyms: unthinking, unthinkingly |
| thriftlessly | (adverb) in a thriftless manner | - |
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| tirelessly | (adverb) with indefatigable energy | Synonyms: indefatigably, inexhaustibly |
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| tonelessly | (adverb) in a monotone | - |
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| tunelessly | (adverb) in a tuneless fashion | - |
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| uselessly | (adverb) in a useless manner | - |
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| wordlessly | (adverb) without speaking | Synonyms: mutely, silently, taciturnly |
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| worthlessly | (adverb) in a worthless manner | - |
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