| impromptu | (adverb) without advance preparation | Synonyms: ad lib, ad libitum, spontaneously |
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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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| inaccurately | (adverb) in an inaccurate manner | - |
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| inadequately | (adverb) in an inadequate manner or to an inadequate degree | - |
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| inarguably | (adverb) in an unarguable and undisputed manner | Synonyms: unarguably, undisputedly |
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| inarticulately | (adverb) in an inarticulate manner | - |
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| (adverb) without eloquence; in an inarticulate manner | Synonyms: ineloquently |
| inaudibly | (adverb) in an inaudible manner | - |
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| inaugurally | (adverb) so as to inaugurate | - |
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| inauspiciously | (adverb) in an inauspicious manner | Synonyms: unpropitiously |
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| incautiously | (adverb) without caution or prudence | Synonyms: carelessly |
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| incestuously | (adverb) by incest | - |
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| inconclusively | (adverb) not conclusively | - |
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| incongruously | (adverb) in an incongruous manner | - |
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| inconsequentially | (adverb) lacking consequence | Synonyms: inconsequently |
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| inconsequently | (adverb) lacking consequence | Synonyms: inconsequentially |
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| inconspicuously | (adverb) in a manner intended to avoid attracting attention | - |
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| incredulously | (adverb) in an incredulous manner | Synonyms: disbelievingly, unbelievingly |
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| incurably | (adverb) in a manner impossible to cure | - |
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| (adverb) to an incurable degree | - |
| indecorously | (adverb) without decorousness | Synonyms: unbecomingly |
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| indigenously | (adverb) in an indigenous manner | - |
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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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| ineffectually | (adverb) in an ineffectual manner | - |
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| inefficaciously | (adverb) in an ineffective manner | Synonyms: ineffectively |
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| ineloquently | (adverb) without eloquence; in an inarticulate manner | Synonyms: inarticulately |
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| ineluctably | (adverb) by necessity | Synonyms: inescapably, inevitably, unavoidably |
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| inequitably | (adverb) in an inequitable manner | - |
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| inexcusably | (adverb) in an unpardonable manner or to an unpardonable degree | Synonyms: unforgivably, unpardonably |
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| (adverb) without any excuse | Synonyms: unjustifiably |
| inexhaustibly | (adverb) with indefatigable energy | Synonyms: indefatigably, tirelessly |
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| infectiously | (adverb) in a contagious manner | Synonyms: contagiously |
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| infelicitously | (adverb) in an infelicitous manner | - |
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| influentially | (adverb) exerting influence | - |
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| infrequently | (adverb) not many times | - |
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| ingeniously | (adverb) in an ingenious manner | - |
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| ingenuously | (adverb) in an ingenuous manner | Synonyms: artlessly |
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| ingloriously | (adverb) in a dishonorable manner or to a dishonorable degree | Synonyms: discreditably, disgracefully, dishonorably, dishonourably, ignominiously, shamefully |
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| inhumanely | (adverb) in an inhumane manner | - |
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| iniquitously | (adverb) in an iniquitous manner | - |
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| injudiciously | (adverb) in an injudicious manner | - |
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| injuriously | (adverb) in an injurious manner | - |
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| inopportunely | (adverb) at an inconvenient time | Synonyms: malapropos |
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| inquiringly | (adverb) in an inquiring manner | Synonyms: enquiringly |
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| inquisitively | (adverb) with curiosity | Synonyms: curiously, interrogatively |
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| inscrutably | (adverb) in an inscrutable manner | - |
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| insecurely | (adverb) in a manner involving risk | - |
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| (adverb) in a tentative and self-conscious manner | - |
| insidiously | (adverb) in a harmfully insidious manner | Synonyms: perniciously |
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| insinuatingly | (adverb) in an insinuating manner | - |
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| insomuch | (adverb) to such an extent or degree; so | - |
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| instantaneously | (adverb) without any delay | Synonyms: in a flash, instantly, outright |
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| institutionally | (adverb) by an institution | - |
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| instructively | (adverb) in an informative manner | Synonyms: informatively |
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| insubstantially | (adverb) not substantially; lacking substantial expression or fullness | Synonyms: impalpably |
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| insufferably | (adverb) in an extremely arrogant or conceited manner | - |
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| (adverb) to an insufferable degree | Synonyms: unsufferably |
| insufficiently | (adverb) to an insufficient degree | - |
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| insultingly | (adverb) in an unfair and insulting manner | Synonyms: foully |
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| (adverb) in a disrespectful and insulting manner | - |
| insuperably | (adverb) to an insuperable degree | - |
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| intellectually | (adverb) of or relating to the intellect | - |
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| intramuscularly | (adverb) in an intramuscular way | - |
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| intravenously | (adverb) in an intravenous manner | - |
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| intuitively | (adverb) in an intuitive manner | - |
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| invidiously | (adverb) in a manner arousing resentment | - |
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| involuntarily | (adverb) against one's will or done without conscious thought | - |
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| irregularly | (adverb) in an inconstant manner, not according to fixed rate or schedule | Synonyms: on an irregular basis |
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| (adverb) at an uneven rate | - |
| (adverb) having an irregular form | - |
| irresolutely | (adverb) lacking determination or decisiveness | - |
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| jauntily | (adverb) in a jaunty fashionable manner | - |
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| jealously | (adverb) with jealousy | - |
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| (adverb) with jealousy; in an envious manner | Synonyms: covetously, enviously |
| jejunely | (adverb) in an immature manner | Synonyms: immaturely |
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| jocular | (adverb) with humor | Synonyms: jocosely |
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| journalistically | (adverb) by journalists | - |
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| joyfully | (adverb) in a joyous and gleeful manner | Synonyms: gleefully, joyously |
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| joyously | (adverb) in a joyous and gleeful manner | Synonyms: gleefully, joyfully |
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| jubilantly | (adverb) in a joyous manner | Synonyms: blithely, gayly, happily, merrily, mirthfully |
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| judicially | (adverb) in a judicial manner | - |
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| (adverb) as ordered by a court | - |
| judiciously | (adverb) in a judicious manner | - |
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| jurisprudentially | (adverb) in respect to jurisprudence or the science or philosophy of law | - |
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| just | (adverb) and nothing more | Synonyms: but, merely, only, simply |
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| (adverb) only a moment ago | Synonyms: just now |
| (adverb) (used for emphasis) absolutely | Synonyms: simply |
| (adverb) only a very short time before | Synonyms: barely, hardly, scarce, scarcely |
| (adverb) indicating exactness or preciseness | Synonyms: exactly, precisely, properly |
| (adverb) exactly at this moment or the moment described | - |
| (adverb) possibly (indicating a slight chance of something being true) | - |
| (adverb) by a little | Synonyms: barely |
| justifiably | (adverb) with good reason | - |
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| justifiedly | (adverb) with honesty | Synonyms: justly, rightly |
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| justly | (adverb) in accordance with moral or social standards | Synonyms: right |
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| (adverb) with honesty | Synonyms: justifiedly, rightly |
| laboriously | (adverb) in a laborious manner | - |
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| languidly | (adverb) in a languid and lethargic manner | - |
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| languorously | (adverb) in a languorous manner | - |
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| lasciviously | (adverb) in a lascivious manner | Synonyms: salaciously |
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| laudably | (adverb) in an admirable manner | Synonyms: admirably, commendable, praiseworthily |
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| laughably | (adverb) so as to arouse or deserve laughter | Synonyms: ludicrously, preposterously, ridiculously |
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| laughingly | (adverb) with laughter; while laughing | - |
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| lawfully | (adverb) by law; conforming to the law | Synonyms: de jure, legally |
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| (adverb) in a manner acceptable to common custom | Synonyms: legitimately, licitly |
| leisurely | (adverb) in an unhurried way or at one's convenience | Synonyms: at leisure |
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| licentiously | (adverb) in a licentious and promiscuous manner | Synonyms: promiscuously, wantonly |
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| lingually | (adverb) with respect to language | Synonyms: linguistically |
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| linguistically | (adverb) with respect to language | Synonyms: lingually |
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| (adverb) with respect to the science of linguistics | - |
| longitudinally | (adverb) with respect to longitude | - |
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| (adverb) in the direction of the length | Synonyms: lengthways, lengthwise, longways, longwise |
| (adverb) across time | - |
| loquaciously | (adverb) in a chatty loquacious manner | Synonyms: garrulously, talkatively, talkily |
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| loud | (adverb) with relatively high volume | Synonyms: aloud, loudly |
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