ra·tio·nal 
/ˈræʃənl̟/ adjective
/ˈræʃənl̟/ adjective 1 : based on facts or reason and not on emotions or feelings
▪ a rational decision/choice ▪ I'm sure there is a rational [=sensible, reasonable] explanation for his decision. 2 : having the ability to reason or think about things clearly
▪ No rational [=sane] person would behave like that. ▪ Humans are rational beings. [=are able to use reason when thinking about something] — opposite irrational
▪ a rational decision/choice ▪ I'm sure there is a rational [=sensible, reasonable] explanation for his decision.
▪ No rational [=sane] person would behave like that. ▪ Humans are rational beings. [=are able to use reason when thinking about something] — opposite irrational
— ra·tio·nal·i·ty /ˌræʃəˈnæləti/ noun [noncount] formal
▪ The rationality of that statement is questionable.
/ˌræʃəˈnæləti/ noun [noncount] formal ▪ The rationality of that statement is questionable.
— ra·tio·nal·ly adverb
▪ Think about the problem rationally. ▪ She stayed calm and acted rationally. [=sensibly]
▪ Think about the problem rationally. ▪ She stayed calm and acted rationally. [=sensibly]
