/ˈræʃnəl/ [adj.] (of behaviour, ideas, etc) based on reason rather that emotions a rational argument/choice/decision rational analysis/thought There is no rational explanation for his actions. [adj.] (of a person) able to think clearly and make decisions based on reason rather than emotions No rational person would ever behave like that. ADJ （想法、决定等）合理的，基于理性的；（人）理性的，理智的；富有理性的；（数）有理的，有理数的 n. 有理数 复数 rationals 比较级 more rational 最高级 most rational