introvert ⇔ extrovert

/’ɪntrəvɜːt/　/’ɪntrəvɜːrt/　noun 内気な人

★ a quiet person who is more interested in their own thoughts and feelings than in spending time with other people

・He was described as an introvert, a reserved man who spoke little.

/'ekstrəvɜːt/　/'ekstrəvɜːrt/　noun

★ a lively and confident person who enjoys being with other people

・She's a real extrovert and loves to socialize and meet new people.

lively　/'laɪvli/   adj)元気な･はつらつとした･陽気な