Definition of ineffable

nocturnal Definition: (adjective) of the night; active at night. Petersons.com

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< ineducable

ineffaceable >

in·ef·fa·ble    (n-f-bl) KEY  

ADJECTIVE:

1. Incapable of being expressed; indescribable or unutterable. See Synonyms at unspeakable.
2. Not to be uttered; taboo: the ineffable name of God.

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ETYMOLOGY:
Middle English, from Old French, from Latin ineffbilis : in-, not ; see in- ¹ + effbilis, utterable (from effr, to utter : ex-, ex- + fr, to speak; see bh- ² in Indo-European roots)

OTHER FORMS:
in·effa·bili·ty or in·effa·ble·ness (Noun), in·effa·bly (Adverb)

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