| unromantic | (adjective) neither expressive of nor exciting sexual love or romance | - |
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| unromantically | (adverb) without romance; in an unromantic manner | - |
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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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| vigilantism | (noun) the actions of a vigilance committee in trying to enforce the laws | - |
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| wanting | (adjective) inadequate in amount or degree | Synonyms: deficient, lacking |
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| (adjective) nonexistent | Synonyms: absent, lacking, missing |