- that cannot be spoken
- marvelous, awesome, etc.; beyond human expression; ineffable
- so bad, evil, etc. as to defy description
- so foul, evil, etc. as to be unfit to be described or discussed: unspeakable depravity
See unspeakable in American Heritage Dictionary 4
- Beyond description; inexpressible: unspeakable happiness.
- Inexpressibly bad or objectionable: unspeakable poverty.
- Not to be spoken: unspeakable thoughts.
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