Choose the perfect synonym or antonym for the word

Rational

/ˈræʃənəl/

Based on reason and logic rather than emotions or impulses

Synonyms:

He knows he is wrong, and has nothing rational to urge.

Or else turn it into something rational, or even useful?

It seemed hardly rational to be thankful for such a life.

From Middle French rationel, from Latin rationalis, from ratio meaning reason.

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