What is another word for unpardonable?

Need synonyms for unpardonable? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Impossible to excuse or justify
“It is an unpardonable negligence to place the ornaments arbitrarily how they wish.”
Adjective
Unable to be supported or justified
Adjective
Arousing revulsion or strong indignation
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