| adulterously | (adverb) in an adulterous manner | - |
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| arduously | (adverb) in an arduous manner | - |
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| assiduously | (adverb) with care and persistence | - |
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| credulously | (adverb) in a credulous manner | Synonyms: believingly |
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| dubiously | (adverb) in a doubtful manner | Synonyms: doubtfully |
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| (adverb) in a questionable and dubious manner | Synonyms: questionably |
| due | (adverb) directly or exactly; straight | - |
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| dully | (adverb) without liveliness | - |
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| (adverb) without luster or shine | - |
| duly | (adverb) in accordance with what is appropriate or suitable for the circumstances | Synonyms: appropriately, befittingly, fitly, fittingly, properly, suitably |
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| dumbly | (adverb) mutely | - |
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| (adverb) stupidly or insensitively | Synonyms: densely, obtusely |
| dutifully | (adverb) out of a sense of duty; in a dutiful manner | - |
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| educationally | (adverb) in an educational manner | - |
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| enduringly | (adverb) in an enduring manner | - |
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| fraudulently | (adverb) in a dishonest and fraudulent manner | - |
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| gradually | (adverb) in a gradual manner | Synonyms: bit by bit, step by step |
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| incredulously | (adverb) in an incredulous manner | Synonyms: disbelievingly, unbelievingly |
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| individualistically | (adverb) in an individualistic manner | - |
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| individually | (adverb) apart from others | Synonyms: on an individual basis, one by one, separately, severally, singly |
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| indubitably | (adverb) in a manner or to a degree that could not be doubted | Synonyms: beyond a doubt, beyond a shadow of a doubt, beyond doubt |
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| indulgently | (adverb) in an indulgent manner | - |
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| industrially | (adverb) by industrial means | - |
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| industriously | (adverb) in an industrious manner | - |
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| obdurately | (adverb) in a stubborn unregenerate manner | Synonyms: cussedly, mulishly, obstinately, pig-headedly, stubbornly |
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| productively | (adverb) in a productive way | Synonyms: fruitfully, profitably |
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| reproducibly | (adverb) in a manner that is reproducible | - |
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| seductively | (adverb) in a tempting seductive manner | Synonyms: temptingly |
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| sedulously | (adverb) in a sedulous manner | - |
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| unduly | (adverb) to an undue degree | - |
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| unproductively | (adverb) in an unproductive manner | Synonyms: fruitlessly, unprofitably |
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| unreproducibly | (adverb) in an unreproducible manner | Synonyms: inimitably |
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