Rational thinking is a type of thought process that involves using LOGIC and REASON to make decisions. It is based on the idea that decisions should be made based on facts and evidence rather than emotion or opinion. The two crossword solutions for the term rational thinking are 'LOGIC' (5 letters) and 'REASON' (6 letters). LOGIC is the process of making sense of things by using facts and evidence, while REASON is the ability to think logically and make sound judgments. Both of these terms are closely related to rational thinking, as they involve using facts and evidence to make decisions.