adv ·Rare ·Advanced level

Definitions

Adverb

1. 1
   In an unmentionable way; indescribably, unutterably, unspeakably.

   "They sat down and had one of their old chummy talks until an unmentionably late hour."

Example

More examples

"They sat down and had one of their old chummy talks until an unmentionably late hour."

Etymology

From unmentionable + -ly.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.