Based on reason and logic rather than emotions or impulses
Examples:
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.
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Rationale
/ˌræʃəˈnɑːl/
A set of reasons or a logical basis for a course of action or belief
Examples:
The rationale behind the rule remained unclear.She explained the rationale for her decision calmly.His rationale for the changes convinced the board.
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Ways to tell them apart:
Remember that rational refers to reasoning or logic, using your rational mind to solve problems.
Rationale contains the word ale, which is not as common in logical reasoning discussions, but rather in theoretical explanations.
Rational is an adjective, so it often describes a person or a decision with logic, whereas rationale is a noun describing the reason behind something.