| surfactant | (noun) a chemical agent capable of reducing the surface tension of a liquid in which it is dissolved | Synonyms: surface-active agent, wetter, wetting agent |
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| tantalise | (verb) harass with persistent criticism or carping | Synonyms: bait, cod, rag, rally, razz, ride, tantalize, taunt, tease, twit |
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| tantaliser | (noun) someone who tantalizes; a tormentor who offers something desirable but keeps it just out of reach | Synonyms: tantalizer |
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| tantalising | (adjective) very pleasantly inviting | Synonyms: tantalizing, tempting |
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| (adjective) arousing desire or expectation for something unattainable or mockingly out of reach | Synonyms: tantalizing |
| tantalite | (noun) a mineral consisting of tantalum oxide of iron and manganese that occurs with niobite or in coarse granite; an ore of tantalum | - |
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| tantalization | (noun) the act of harassing someone playfully or maliciously (especially by ridicule); provoking someone with persistent annoyances | Synonyms: ribbing, tease, teasing |
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| tantalize | (verb) harass with persistent criticism or carping | Synonyms: bait, cod, rag, rally, razz, ride, tantalise, taunt, tease, twit |
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| tantalizer | (noun) someone who tantalizes; a tormentor who offers something desirable but keeps it just out of reach | Synonyms: tantaliser |
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| tantalizing | (adjective) very pleasantly inviting | Synonyms: tantalising, tempting |
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| (adjective) arousing desire or expectation for something unattainable or mockingly out of reach | Synonyms: tantalising |
| tantalizingly | (adverb) in a tantalizing manner | Synonyms: invitingly |
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| tantalum | (noun) a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite | Synonyms: atomic number 73, Ta |
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| tantamount | (adjective) being essentially equal to something | Synonyms: equivalent |
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| tantra | (noun) any of a fairly recent class of Hindu or Buddhist religious literature concerned with ritual acts of body and speech and mind | - |
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| tantrum | (noun) a display of bad temper | Synonyms: conniption, fit, scene |
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| transubstantiate | (verb) change or alter in form, appearance, or nature | Synonyms: transform, transmute |
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| (verb) change (the Eucharist bread and wine) into the body and blood of Christ | - |
| transubstantiation | (noun) an act that changes the form or character or substance of something | Synonyms: transmutation |
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| (noun) the Roman Catholic doctrine that the whole substance of the bread and the wine changes into the substance of the body and blood of Christ when consecrated in the Eucharist | - |
| unimportant | (adjective) not important | - |
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| (adjective) devoid of importance, meaning, or force | Synonyms: insignificant |
| unrepentant | (adjective) not penitent or remorseful | Synonyms: impenitent, unremorseful |
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| (adjective) stubbornly persistent in wrongdoing | Synonyms: cussed, obdurate, obstinate |
| unrepentantly | (adverb) in an impenitent manner | Synonyms: impenitently |
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| unresistant | (adjective) (often followed by `to') likely to be affected with | Synonyms: liable, nonimmune, nonresistant |
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| unsubstantial | (adjective) lacking material form or substance; unreal | Synonyms: insubstantial, unreal |
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| unsubstantialise | (verb) render immaterial or incorporeal | Synonyms: immaterialise, immaterialize, unsubstantialize |
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| unsubstantialize | (verb) render immaterial or incorporeal | Synonyms: immaterialise, immaterialize, unsubstantialise |
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| unsubstantiated | (adjective) unsupported by other evidence | Synonyms: uncorroborated |
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| visitant | (noun) someone who visits | Synonyms: visitor |
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