Unmentionable

[ʌn'menʃ(ə)nəb(ə)l] or [ʌn'mɛnʃənəbl]

Definition

(adj.) unsuitable or forbidden as a topic of conversation; 'unmentionable words' .

Edited by Beverly--From WordNet

Definition

adj. unworthy of being mentioned.—n. Unmen′tionableness.—n.pl. Unmen′tionables otherwise inexpressibles a would-be humorous name for trousers.

Checker: Quincy