| pro | (adverb) in favor of a proposition, opinion, etc. | - |
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| probabilistically | (adverb) by the use of probability theory | - |
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| probably | (adverb) with considerable certainty; without much doubt | Synonyms: belike, in all likelihood, in all probability, likely |
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| (adverb) easy to believe on the basis of available evidence | Synonyms: believably, credibly, plausibly |
| problematically | (adverb) in such a way as to pose a problem | - |
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| prodigally | (adverb) to a wasteful manner or to a wasteful degree | Synonyms: wastefully |
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| prodigiously | (adverb) to a prodigious degree | - |
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| productively | (adverb) in a productive way | Synonyms: fruitfully, profitably |
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| profanely | (adverb) in an irreverent or profane manner | - |
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| (adverb) with curses | - |
| professedly | (adverb) with pretense or intention to deceive | - |
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| (adverb) by open declaration | Synonyms: avowedly |
| professionally | (adverb) in a professional manner | - |
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| professorially | (adverb) in a professorial manner | - |
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| proficiently | (adverb) in a proficient manner | - |
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| profitably | (adverb) in a productive way | Synonyms: fruitfully, productively |
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| profitlessly | (adverb) without gain or profit | Synonyms: gainlessly, unprofitably |
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| profligately | (adverb) in a dissolute way | Synonyms: dissolutely |
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| profoundly | (adverb) to a great depth psychologically or emotionally | Synonyms: deeply, intensely |
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| profusely | (adverb) in an abundant manner | Synonyms: abundantly, copiously, extravagantly |
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| progressively | (adverb) advancing in amount or intensity | Synonyms: increasingly, more and more |
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| prohibitively | (adverb) to a prohibitive degree | - |
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| prominently | (adverb) in a prominent way | Synonyms: conspicuously |
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| promiscuously | (adverb) in a licentious and promiscuous manner | Synonyms: licentiously, wantonly |
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| (adverb) in an indiscriminate manner | Synonyms: indiscriminately |
| promisingly | (adverb) in a manner that gives hope | - |
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| promptly | (adverb) in a punctual manner | Synonyms: pronto, readily |
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| (adverb) at once (usually modifies an undesirable occurrence) | Synonyms: right away |
| (adverb) with little or no delay | Synonyms: quick, quickly |
| pronto | (adverb) in a punctual manner | Synonyms: promptly, readily |
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| properly | (adverb) in the right manner; correctly; suitably | Synonyms: decent, decently, right |
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| (adverb) in accordance with what is appropriate or suitable for the circumstances | Synonyms: appropriately, befittingly, duly, fitly, fittingly, suitably |
| (adverb) indicating exactness or preciseness | Synonyms: exactly, just, precisely |
| prophetically | (adverb) in a prophetic manner | - |
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| propitiously | (adverb) in an auspicious manner | Synonyms: auspiciously |
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| proportionally | (adverb) to a proportionate degree | Synonyms: proportionately |
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| proportionately | (adverb) to a proportionate degree | Synonyms: proportionally |
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| (adverb) in a way that is in correspondence among the constituents of another entity | - |
| (adverb) in a way that agrees in amount, magnitude or degree | Synonyms: pro rata |
| prosaically | (adverb) in a matter-of-fact manner | Synonyms: unimaginatively |
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| prosily | (adverb) in a prosy manner | - |
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| prosperously | (adverb) in the manner of prosperous people | - |
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| protectively | (adverb) in a protective manner | - |
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| protractedly | (adverb) in a slow, leisurely or prolonged way | Synonyms: lingeringly |
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| proudly | (adverb) with pride; in a proud manner | - |
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| provably | (adverb) in an obvious and provable manner | Synonyms: demonstrably, incontrovertibly |
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| proverbially | (adverb) in the manner of something that has become a byword | - |
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| providentially | (adverb) in a providential manner; as determined by providence | - |
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| (adverb) in a fortunately providential manner | - |
| (adverb) in a prudent manner | Synonyms: prudently |
| providently | (adverb) in a provident manner | - |
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| provincially | (adverb) by the province; through the province | - |
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| provisionally | (adverb) temporarily and conditionally | - |
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| provocatively | (adverb) in a provocative manner | Synonyms: provokingly |
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| provokingly | (adverb) in a provocative manner | Synonyms: provocatively |
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