unmentionable unmentionability • unmentionableness · · · Info · Definitions · Synonyms · Characters · · unmentionable · · Text Latin · · Script 13 · · Length Definitions · · · (noun) a garment worn under other garments. Synonyms: undergarment. · · Noun Definition 1 (adj) unsuitable or forbidden as a topic of conversation. Example: "Unmentionable words." · · Adjective Definition 1 Synonyms · · · undergarment · · Synonym 1 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074 u latin small letter u U+0075