Kanji 込 crowded, mixture, in bulk Related words 引っ込み思案 suggests a reluctance to step forward or take initiative, often due to shyness, while 内気 focuses more on the internal feeling of shyness or reserve.
引っ込み思案 describes a shy, hesitant reluctance to put oneself forward, whereas 非社交的 more broadly describes a general dislike of socializing.
引っ込み思案 emphasizes a hesitance to speak up or act, whereas 内向的 is a more general term for an introspective, inward personality.
引っ込み思案 describes a reserved, hesitant personality that holds back from social situations in general, while 人見知り is specifically about strangers.
Etymology Formed from 引っ込み , “withdrawal” or “holding back,” and 思案 , “thought, consideration.” Attested from the early Edo period, it describes a timid or retiring disposition that avoids coming forward.
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