| thankful | (adjective) feeling or showing gratitude | Synonyms: grateful |
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| thankfully | (adverb) let us be thankful that | - |
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| (adverb) in a thankful manner; with thanks | Synonyms: gratefully |
| thankfulness | (noun) warm friendly feelings of gratitude | Synonyms: appreciativeness, gratefulness |
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| thimbleful | (noun) as much as a thimble will hold | Synonyms: thimble |
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| thoughtful | (adjective) exhibiting or characterized by careful thought | - |
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| (adjective) taking heed; giving close and thoughtful attention | Synonyms: attentive, heedful, paying attention |
| (adjective) considerate of the feelings or well-being of others | - |
| (adjective) having intellectual depth | - |
| (adjective) characterized by solemn, sincere manner | Synonyms: serious-minded |
| thoughtfully | (adverb) showing consideration and thoughtfulness | - |
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| (adverb) in a thoughtful manner | - |
| thoughtfulness | (noun) a considerate and thoughtful act | Synonyms: consideration |
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| (noun) the trait of thinking carefully before acting | - |
| (noun) kind and considerate regard for others | Synonyms: considerateness, consideration |
| (noun) a calm, lengthy, intent consideration | Synonyms: contemplation, musing, reflection, reflexion, rumination |
| thrillful | (adjective) full of excitement; thrilled | - |
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| tofu | (noun) cheeselike food made of curdled soybean milk | Synonyms: bean curd |
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| transfuse | (verb) treat by applying evacuated cups to the patient's skin | Synonyms: cup |
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| (verb) give a transfusion (e.g., of blood) to | - |
| (verb) pour out of one vessel into another | - |
| (verb) impart gradually | Synonyms: instill |
| transfusion | (noun) the introduction of blood or blood plasma into a vein or artery | Synonyms: blood transfusion |
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| (noun) the action of pouring a liquid from one vessel to another | - |
| trayful | (noun) as much as a tray will hold; enough to fill a tray. | - |
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| trifurcate | (verb) divide into three | - |
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| trifurcation | (noun) the act of splitting into three branches | - |
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| trustful | (adjective) inclined to believe or confide readily; full of trust | Synonyms: trusting |
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| trustfully | (adverb) with trust; in a trusting manner | Synonyms: confidingly, trustingly |
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| (adverb) in a trustful manner | - |
| trustfulness | (noun) the trait of believing in the honesty and reliability of others | Synonyms: trust, trustingness |
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| truthful | (adjective) expressing or given to expressing the truth | Synonyms: true |
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| (adjective) conforming to truth | - |
| truthfully | (adverb) with truth | - |
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| truthfulness | (noun) the quality of being truthful | - |
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| tubful | (noun) the amount that a tub will hold | Synonyms: tub |
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| tuneful | (adjective) having a musical sound; especially a pleasing tune | Synonyms: melodious |
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| tunefully | (adverb) in a melodious manner | Synonyms: melodiously |
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| tunefulness | (noun) the property of having a melody | Synonyms: melodiousness |
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| ultracentrifugation | (noun) centrifugation at very high speeds | - |
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| ultracentrifuge | (noun) a high speed centrifuge used to determine the relative molecular masses of large molecules in high polymers and proteins | - |
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| (verb) subject to the action of an ultracentrifuge | - |
| uncheerful | (adjective) causing sad feelings of gloom and inadequacy | Synonyms: cheerless, depressing |
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| uncheerfulness | (noun) not conducive to cheer or good spirits | - |
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| (noun) a feeling of dreary or pessimistic sadness | Synonyms: cheerlessness |
| unconfused | (adjective) not perplexed by conflicting situations or statements | Synonyms: unbaffled |
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| underfur | (noun) thick soft fur lying beneath the longer and coarser guard hair | Synonyms: undercoat |
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| undutiful | (adjective) lacking due respect or dutifulness | Synonyms: impious |
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| undutifulness | (noun) impiety characterized by lack of devotion to duty | - |
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| uneventful | (adjective) marked by no noteworthy or significant events | - |
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| uneventfully | (adverb) in an uneventful manner | - |
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| unfaithful | (adjective) not true to duty or obligation or promises | - |
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| (adjective) having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend | - |
| (adjective) having the character of, or characteristic of, a traitor | Synonyms: faithless, traitorous, treasonable, treasonous |
| (adjective) not trustworthy | - |
| unfaithfully | (adverb) in an unfaithful undependable unreliable manner | Synonyms: undependably, unreliably |
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| unfaithfulness | (noun) the quality of being unfaithful | Synonyms: infidelity |
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| unforceful | (adjective) lacking force; feeble | Synonyms: forceless |
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| unforesightful | (adjective) lacking foresight or scope | Synonyms: myopic, short, shortsighted |
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| unforethoughtful | (adjective) lacking forethought | - |
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| unfruitful | (adjective) not fruitful; not conducive to abundant production | - |
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| unfueled | (adjective) not provided with fuel | - |
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| unfulfilled | (adjective) of persons; marked by failure to realize full potentialities | Synonyms: unrealised, unrealized |
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| unfunctional | (adjective) not related to or suitable for everyday needs or activities | - |
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| unfunded | (adjective) not furnished with funds | - |
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| unfunny | (adjective) not funny; especially failing to achieve the intended humor | - |
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| unfurl | (verb) unroll, unfold, or spread out or be unrolled, unfolded, or spread out from a furled state | Synonyms: unroll |
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| unfurnished | (adjective) not equipped with what is needed especially furniture | - |
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| unfurrowed | (adjective) not marked with shallow depressions or furrows | - |
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| ungraceful | (adjective) lacking grace; clumsy | Synonyms: graceless |
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| ungracefully | (adverb) without grace; rigidly | Synonyms: gracelessly, ungraciously, woodenly |
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| ungracefulness | (noun) an unpleasant lack of grace in carriage or form or movement or expression | Synonyms: gracelessness |
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| ungrateful | (adjective) not feeling or showing gratitude | Synonyms: thankless, unthankful |
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| (adjective) disagreeable | - |
| ungratefully | (adverb) in an ungrateful manner | Synonyms: unappreciatively |
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| ungratefulness | (noun) a lack of gratitude | Synonyms: ingratitude |
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| unhealthful | (adjective) detrimental to good health | - |
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| (adjective) not sanitary or healthful | Synonyms: insanitary, unsanitary |
| (adjective) detrimental to health | Synonyms: insalubrious, unhealthy |
| unhealthfulness | (noun) the quality of promoting poor health | - |
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| unhelpful | (adjective) providing no assistance | - |
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| unhelpfully | (adverb) in an unhelpful manner | - |
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| unhelpfulness | (noun) an inability to be helpful | - |
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| unhopeful | (adjective) showing utter resignation or hopelessness | Synonyms: abject |
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| unlawful | (adjective) contrary to or prohibited by or defiant of law | - |
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| (adjective) contrary to or forbidden by law | Synonyms: illegitimate, illicit, outlaw, outlawed |
| (adjective) having no legally established claim | Synonyms: wrongful |
| (adjective) not morally right or permissible | - |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: improper, unconventional |
| unlawfully | (adverb) not conforming to the law | - |
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| unlawfulness | (noun) the quality of failing to conform to law | - |
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| unmanful | (adjective) not possessing qualities befitting a man | Synonyms: unmanlike, unmanly |
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| unmanfully | (adverb) without qualities thought to befit a man | Synonyms: unmanly |
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| unmerciful | (adjective) having or showing no mercy | Synonyms: merciless |
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| unmercifully | (adverb) without pity; in a merciless manner | Synonyms: mercilessly, pitilessly, remorselessly |
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| unmercifulness | (noun) inhumaneness evidenced by an unwillingness to be kind or forgiving | Synonyms: mercilessness |
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| unmindful | (adjective) not mindful or attentive | Synonyms: forgetful, mindless |
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| (adjective) (followed by `to' or `of') lacking conscious awareness of | Synonyms: oblivious |
| unmindfully | (adverb) in a careless and thoughtless manner | - |
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| unmindfulness | (noun) the trait of forgetting or ignoring your responsibilities | Synonyms: heedlessness, inadvertence, inadvertency |
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| unpainful | (adjective) not accompanied by pain sensations | Synonyms: pain-free |
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| unpeaceful | (adjective) not peaceful | - |
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| unplayful | (adjective) completely lacking in playfulness | Synonyms: serious, sober |
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| unregretful | (adjective) feeling no regret | Synonyms: unregretting |
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| unremorseful | (adjective) not penitent or remorseful | Synonyms: impenitent, unrepentant |
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| unresentful | (adjective) not resentful | - |
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| unskillful | (adjective) poorly done | Synonyms: botchy, butcherly |
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| unskillfulness | (noun) a lack of cognitive skill | - |
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| unsuccessful | (adjective) not successful; having failed or having an unfavorable outcome | - |
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| (adjective) failing to accomplish an intended result | Synonyms: abortive, stillborn |
| unsuccessfully | (adverb) without success | - |
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| untactful | (adjective) lacking or showing a lack of what is fitting and considerate in dealing with others | Synonyms: tactless |
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| unthankful | (adjective) not feeling or showing gratitude | Synonyms: thankless, ungrateful |
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| unthoughtful | (adjective) not exhibiting or characterized by careful thought | Synonyms: unreflective, unthinking |
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| unthoughtfulness | (noun) the trait of not thinking carefully before acting | Synonyms: thoughtlessness |
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| untruthful | (adjective) not expressing or given to expressing the truth | - |
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| untruthfully | (adverb) in a mendacious and untruthful manner | Synonyms: mendaciously |
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| untruthfulness | (noun) the quality of being untruthful | - |
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| untuneful | (adjective) not having a musical sound or pleasing tune | Synonyms: tuneless, unmelodious |
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| unusefulness | (noun) the quality of having no practical use | Synonyms: inutility, uselessness |
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| unwatchful | (adjective) not alert to what is potentially dangerous | Synonyms: unalert, unvigilant |
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| useful | (adjective) being of use or service | Synonyms: utile |
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| (adjective) having a useful function | Synonyms: utilitarian |
| usefully | (adverb) in a useful manner | - |
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| usefulness | (noun) the quality of being of practical use | Synonyms: utility |
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| vengeful | (adjective) disposed to seek revenge or intended for revenge | Synonyms: revengeful, vindictive |
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| vengefully | (adverb) in a vindictive, revengeful manner | Synonyms: revengefully, vindictively |
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| vengefulness | (noun) a malevolent desire for revenge | Synonyms: vindictiveness |
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| vermifuge | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, anthelmintic, helminthic |
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| waifu | (noun) a character in an anime or manga who one has romantic feelings for | - |
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