「激しい」(はげしい) describes something strong, intense, or fierce in its action or degree. It can refer to physical phenomena like heavy rain or strong wind, emotions like intense anger, or activities like fierce competition, implying forcefulness and extremity. Example: 昨日は激しい雨が降りました。 (There was heavy rain yesterday.)

勢いが強く、程度が極端なこと。