Open English Wordnet
Nouns
(n)excuse, alibi, exculpation, self-justificationa defense of some offensive behavior or some failure to keep a promise etc.“he kept finding excuses to stay”, “every day he had a new alibi for not getting a job”, “his transparent self-justification was unacceptable”
Verbs
(v)apologize, apologise, excuse, rationalize, rationalisedefend, explain, clear away, or make excuses for by reasoning“rationalize the child's seemingly crazy behavior”, “he rationalized his lack of success”