unpardonable
adjective
un·par·don·able
ˌən-ˈpärd-nə-bəl,
-ˈpär-dᵊn-ə-bəl
: too bad to be pardoned or forgiven : not pardonable : unforgivable
unpardonable behavior
an unpardonable sin
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Merriam-Webster unabridged
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