inexcusable
Definitions
Too bad to be justified or forgiven.
Not capable of being excused or pardoned.
Examples
His rude behavior toward the guests was completely inexcusable.
It is inexcusable to leave such important work unfinished before the deadline.
Synonyms
unforgivable unjustifiable indefensible unpardonable intolerable unwarranted inexpiable
Antonyms
justifiable excusable pardonable defensible forgivable warranted acceptable