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erratic; offbeat; wild; unconventional; extraordinary; weird; eccentric; reckless
突飛な発想が画期的な発明を生むこともある。
Wild ideas can sometimes give birth to groundbreaking inventions.
彼の提案は突飛すぎて誰も賛同しなかった。
His proposal was so eccentric that no one agreed.
突飛な行動で周囲を驚かせることが多い。
He often surprises those around him with unconventional actions.