- not speakable; that may not be spoken.
- exceeding the power of speech; unutterable; inexpressible; indescribable.
- inexpressibly bad or objectionable.
- incapable of expression in wordsunspeakable ecstasy
- indescribably bad or evil
- not to be utteredunspeakable thoughts
adj.c.1400, “inexpressible,” from un- (1) “not” + speakable (see speak). Meaning “indescribably bad or wicked” is recorded from 1831. Related: Unspeakably.