Jisho

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せい 威勢
Expressions (phrases, clauses, etc.), I-Adjective (keiyoushi) - yoi/ii class
1. vigorous; cheerful; assertive
Other forms
威勢が良い 【いせいがいい】威勢が良い 【いせいがよい】威勢がよい 【いせいがよい】

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