rationalize
verb
Definition
To provide a rational basis for something, often by false or self-serving reasoning
Synonyms
justify, excuse, defend
Antonyms
accept, admit, recognize
Sentences
She tried to rationalize why she had not done her homework, but she could not give valid reasons.
Some people avoid paying taxes and rationalize it by saying that the government wastes money.
Chris Matthews: Republicans are using CBO report as way to rationalize hatred for Obama