Akademik

unmentionable

adj. & n.
—adj. that cannot (properly) be mentioned.
—n.
1 (in pl.) joc. a undergarments. b archaic trousers.
2 a person or thing not to be mentioned.
Derivatives:
unmentionability n. unmentionableness n. unmentionably adv.

Useful english dictionary. 2012.