One whose attention is habitually directed toward his environment; hence, a practical person, whose acts, emotions, and mental processes are influenced by external conditions rather than by introspection.

【心理】注意环境之人；实事求是之人(其行为、情绪、心思及才智俱为外物所左右，而不待内省者)。

A cheerful person who likes doing things rather than using his mind.

【口】活泼外向不爱用脑的人。

Same as extravert.

亦可作 extravert。