Definition of unspeakable
1a
: incapable of being expressed in words : unutterable
b
: inexpressibly bad : horrendous
unspeakable living conditions unspeakable evil
2
: that may not or cannot be spoken
the bawdy thoughts that come into one's head—the unspeakable words— L. P. Smith unspeakable collections of consonants— Rosemary Jellis
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Merriam-Webster unabridged
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Time Traveler for unspeakable
The first known use of unspeakable was in the 14th century
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