1.
hot (objects, liquids)
High temperature of objects or liquids that can be touched.
コーヒーが熱い。
The coffee is hot.
2.
passionate; fervent; ardent
Strong emotional intensity or enthusiasm.
胸が熱くなる。
My heart feels warm. / I feel moved.
彼は熱い思いで夢を語った。
He spoke of his dreams with passion.
熱い refers to hot objects/liquids and passionate feelings.
DISTINCTION FROM SIMILAR WORDS:
- 熱い: hot to the touch (objects, liquids); passionate
- 暑い: hot weather, uncomfortable heat
- 厚い: thick (objects)
COMMON EXPRESSIONS:
- 熱いお湯: hot water
- 熱いコーヒー: hot coffee
- 熱い視線: passionate gaze
- 熱い戦い: heated battle
- 胸が熱くなる: to feel moved/emotional
FORMS:
- Adverbial: 熱く
- Noun form: 熱さ (heat intensity)
IDIOMATIC:
- 熱い思い: passionate feelings
- 鉄は熱いうちに打て: Strike while the iron is hot