Origin: Latin suffix -able
Untellable has 2 different meanings across 1 category:
defying expression or description
"indefinable yearnings"
"indescribable beauty"
"ineffable ecstasy"
"inexpressible anguish"
"unspeakable happiness"
"unutterable contempt"
"a thing of untellable splendor"
That cannot be told; indefinable, indescribable or ineffable.