headcase
(obsolete) Neither.
Alternative form of backfill
(idiomatic) (It's of) minor importance, at least not as important as it first seemed.
(informal, derogatory) A mentally unbalanced, unpredictable person, especially one who displays aggressive behavior.
会議で精神的に不安定な人が拳で机を叩くと、皆が黙り込んだ。
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DiQt
Free
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