"untellable" 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"
Source: WordNet® (An amazing lexical database of English)
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