undergarment undergardener • undergarnish · · · Info · Definitions · Synonyms · Antonyms · Characters · · undergarment · · Text Latin · · Script 12 · · Length Definitions · · · (noun) a garment worn under other garments. Synonyms: unmentionable. · · Noun Definition 1 Synonyms · · · unmentionable · · Synonym 1 Antonyms · · · overgarment · · Antonym 0 outer garment · · Antonym 1 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 g latin small letter g U+0067 m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075