定義 / Definition
[adjective]
・having an important or dangerous possible result
・demanding or characterized by careful consideration or application.
・acting or speaking sincerely and in earnest, rather than in a joking or half-hearted manner.
・substantial in terms of size, number, or quality.
— その他 例文 —
Things are becoming serious.
事態は深刻になってきている
Road rage in the US is getting serious.
米国では運転中の激怒は深刻になっています。