1. Defying expression or description
   "unspeakable happiness"
   - indefinable, indescribable, ineffable, untellable, unutterable 
2. Exceptionally bad or displeasing
   "an unspeakable odour came sweeping into the room"
   - atrocious, abominable, awful, dreadful, painful, terrible 
3. Too sacred to be uttered
   - ineffable, unnameable, unutterable, unsayable 
4. Not capable of being said
   - unsayable

See also: bad, inexpressible, sacred, unexpressible, unspeakably

Encyclopedia: Unspeakable

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• Norlutin
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• Norma
• Norma Jean Baker
• normal
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• Norman
• Norman architecture
• Norman Conquest
• Norman Jewison