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ineffable (adj.)

late 14c., "beyond expression, too great for words, inexpressible," from Old French ineffable (14c.) or directly from Latin ineffabilis "unutterable," from in- "not, opposite of" (see in- (1)) + effabilis "speakable," from effari "utter," from assimilated form of ex "out" (see ex-) + fari "to say, speak," from PIE root *bha- (2) "to speak, tell, say."

Meaning "that may not be spoken" is from 1590s. Plural noun ineffables was, for a time, a jocular euphemism for "trousers" (1823; see inexpressible). Related: Ineffably.

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Definitions of ineffable from WordNet

ineffable (adj.)
defying expression or description;
ineffable ecstasy
Synonyms: indefinable / indescribable / unspeakable / untellable / unutterable
ineffable (adj.)
too sacred to be uttered;
the ineffable name of the Deity
Synonyms: unnameable / unspeakable / unutterable
From wordnet.princeton.edu