大胆|だいたんdaitan[3]nakadaka (mid-high)

1. na-adjective, nounbold; daring; audacious
   私達わたしたちは彼かれの大胆だいたんな企くわだてに舌したを巻まいた。↗

   We marveled at his bold attempt.

• Synonym不敵ふてきNeutralFearless and unimpressed by the opponent, with a provocative edge, as in 「不敵な笑み」.
• Synonym果敢かかんWrittenWritten-style word for acting resolutely and boldly, as in 「果敢に挑む」; carries a positive tone.
• Synonym勇猛ゆうもうWrittenA written-style noun for fierce valour, as in 「勇猛果敢」; stresses intensity.
• Synonym大胆不敵だいたんふてきNeutralA four-character term for boundless, fearless audacity; stronger than 「大胆」, and it can be praise or criticism.
• Related勇ましいいさましいNeutralBrave and valiant with an emphasis on imposing vigour, as in 「勇ましい姿」.
• Related勇敢ゆうかんNeutralBrave and fearless, as in 「勇敢な兵士」; straightforwardly positive.
• Related壮烈そうれつWrittenWritten-style word for heroic conduct, often in tragic scenes such as dying in battle.
• Related勇壮ゆうそうWrittenWritten-style word for a majestic, imposing air, as in 「勇壮な祭り」; stresses vigour.
• Related健気けなげNeutralAdmirable, praiseworthy effort by someone young or weak facing hardship, as in 「健気な子供」.
• Related果断かだんWrittenA written-style noun for handling matters decisively; the focus is on decisiveness, not daring.
• Related壮絶そうぜつNeutralHeroic and fierce, as in 「壮絶な戦い」; stresses intensity.
• Related向こう見ずむこうみずNeutralA noun for reckless action taken without thought of the consequences; always negative, whereas 「大胆」 can be praise or criticism.
• Related無鉄砲むてっぽうNeutralA noun for headlong behavior that ignores right, wrong and consequences; negative, unlike 「大胆」, which can be praise or criticism.
• Related命知らずいのちしらずNeutralA noun for a daredevil who thinks nothing of risking their life; pejorative.
• Related雄々しいおおしいWrittenManly and heroic; leans toward written prose.
• Related豪胆ごうたんWrittenWritten-style word for exceptional courage, as in 「豪胆な人物」.
• Related剛勇ごうゆうWrittenA written-style noun for strength and valour.
• Related勇烈ゆうれつWrittenWritten-style word for heroic fierceness; rare in modern usage.
• Related雄渾ゆうこんWrittenWritten-style word for powerful, flowing vigour; used of calligraphy, paintings and writing.
• Related冒険的ぼうけんてきNeutralAdventurous; the emphasis is on daring to take risks.
• Related勇邁ゆうまいWrittenWritten-style word for heroic boldness; rare in modern usage.
• Related凛々しいりりしいNeutralDashing and gallant in appearance, as in 「凛々しい顔」; about looks and bearing.
• Related野太いのぶといNeutralOne sense is bold and thick-skinned, with a negative tinge; another describes a deep, rough voice, as in 「野太い声」, with no judgment.
• Antonym小心しょうしんWrittenA written-style noun for timidity and over-caution; the direct opposite of 「大胆」.
• Antonym臆病おくびょうNeutralA noun for cowardice, the common spoken opposite of 「大胆」.

Use 「大胆」 for acting boldly without fear of risk, as in 「大胆な発想」 or 「大胆なデザイン」; it can be praise or criticism. For plain bravery pick 「勇敢」, for resolute action 「果敢」, for reckless disregard of consequences 「向こう見ず」 or 「無鉄砲」, for a dashing look 「凛々しい」, and for cowardice 「臆病」. The rest are mostly literary or narrower: 「壮烈」「勇壮」 for heroic scenes, 「健気」 for admirable effort, 「雄渾」 for powerful brushwork.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 度胸どきょうがあって、物事ものごとを恐おそれずに思い切おもいきってやってのけること。