| impalpably | (adverb) not substantially; lacking substantial expression or fullness | Synonyms: insubstantially |
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| impartially | (adverb) in an impartial manner | - |
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| impassively | (adverb) in an impassive manner | - |
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| impatiently | (adverb) with impatience; in an impatient manner | - |
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| impeccably | (adverb) flawlessly | - |
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| impenitently | (adverb) in an impenitent manner | Synonyms: unrepentantly |
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| imperatively | (adverb) in an imperative and commanding manner | Synonyms: peremptorily |
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| imperceptibly | (adverb) in an imperceptible manner or to an imperceptible degree | Synonyms: unnoticeably |
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| imperfectly | (adverb) in an imperfect or faulty way | Synonyms: amiss |
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| imperially | (adverb) in an imperial manner | - |
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| imperiously | (adverb) in an imperious manner | - |
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| impermissibly | (adverb) not permissibly | - |
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| impersonally | (adverb) without warmth | - |
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| (adverb) in an impersonal manner | - |
| impertinently | (adverb) in an impudent or impertinent manner | Synonyms: freshly, impudently, pertly, saucily |
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| impetuously | (adverb) in an impulsive or impetuous way; without taking cautions | Synonyms: impulsively |
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| impiously | (adverb) in an impious manner | - |
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| impishly | (adverb) in an appealing but bold manner | Synonyms: puckishly |
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| implausibly | (adverb) not easy to believe | Synonyms: improbably, incredibly, unbelievably |
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| implicitly | (adverb) without ever expressing so clearly | - |
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| (adverb) without doubting or questioning | - |
| imploringly | (adverb) in a beseeching manner | Synonyms: beseechingly, entreatingly, importunately, pleadingly |
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| impolitely | (adverb) in an impolite manner | Synonyms: discourteously, rudely |
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| importantly | (adverb) in an important way | - |
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| (adverb) in an important way or to an important degree | Synonyms: significantly |
| importunately | (adverb) in a beseeching manner | Synonyms: beseechingly, entreatingly, imploringly, pleadingly |
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| imposingly | (adverb) in an impressive manner | Synonyms: impressively |
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| impossibly | (adverb) to a degree impossible of achievement | - |
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| impotently | (adverb) in a helpless manner | Synonyms: helplessly |
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| impracticably | (adverb) to an impracticable degree | - |
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| imprecisely | (adverb) in an imprecise manner | Synonyms: inexactly |
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| impregnably | (adverb) in an impregnable manner | - |
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| impressively | (adverb) in an impressive manner | Synonyms: imposingly |
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| improbably | (adverb) not easy to believe | Synonyms: implausibly, incredibly, unbelievably |
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| impromptu | (adverb) without advance preparation | Synonyms: ad lib, ad libitum, spontaneously |
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| improperly | (adverb) in an improper way | - |
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| improvidently | (adverb) in an improvident manner | - |
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| imprudently | (adverb) in an imprudent manner | - |
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| impudently | (adverb) in an impudent or impertinent manner | Synonyms: freshly, impertinently, pertly, saucily |
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| impulsively | (adverb) in an impulsive or impetuous way; without taking cautions | Synonyms: impetuously |
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