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un·men·tion·a·ble / ˌənˈmenchənəbəl/ • adj. too embarrassing, offensive, or shocking to be spoken about: the unmentionable subject of incontinence.• n. (usu. unmentionables) chiefly humorous a person or thing that is too shocking or embarrassing to be mentioned by name: wearing nothing but fig leaves over their unmentionables. ∎  (unmentionables) underwear.DERIVATIVES: un·men·tion·a·bil·i·ty / -ˌmenchənəˈbilətē/ n.un·men·tion·a·ble·ness n.un·men·tion·a·bly / -blē/ adv.