"ineffable" in the adjective sense
1. indefinable, indescribable, ineffable, unspeakable, untellable, unutterable
defying expression or description
"indefinable yearnings"
"indescribable beauty"
"ineffable ecstasy"
"inexpressible anguish"
"unspeakable happiness"
"unutterable contempt"
"a thing of untellable splendor"
2. ineffable, unnameable, unspeakable, unutterable
too sacred to be uttered
"the ineffable name of the Deity"
Source: WordNet® (An amazing lexical database of English)
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