untalkaboutable

English

Etymology

un- +‎ talk about +‎ -able

Adjective

untalkaboutable (comparative more untalkaboutable, superlative most untalkaboutable)

1. (informal) That cannot or must not be discussed.
   • 1862, One Year in Sweden Including a Visit to the Isle of Götland, page 407:

     In the earlier period of Scandinavian history, serpents and dragons were looked upon as untalkaboutable subjects.