adjective incapable of being excused or justified.
Origin: 1375–1425; late Middle English <
Latin inexcūsābilis; see
in-3,
excusable Related forms in·ex·cus·a·bil·i·ty, in·ex·cus·a·ble·ness, noun
in·ex·cus·a·bly, adverb
Synonyms
unpardonable, unforgivable, intolerable.