One entry found for rational.

Entry Word: rational
Function: adjective
Text: 1 having the ability to reason <human beings are rational creatures>
Synonyms intelligent, reasonable, reasoning, thinking
Related Words analytic (or analytical), logical; brainy, cerebral, highbrow, intellectual; cognitive, mental; practical, sane, sensible
Near Antonyms brainless, mindless, stupid; illogical
Antonyms irrational, nonrational, unintelligent, unreasonable, unreasoning, unthinking
2 according to the rules of logic <insisted there was a rational explanation for the strange creaking noises and that there were no such things as ghosts> -- see LOGICAL 1
3 based on sound reasoning or information <taking all your money out of your savings account and hiding it in a sock is not a rational move> -- see GOOD 1