硬化 こうか
kōka

Noun
Suru Verb

1. hardening; vulcanization; vulcanisation; sclerosis; curing

Intransitive
Antonym of 軟化
Noun
Suru Verb

2. hardening (of attitude, stance, etc.); stiffening; toughening

Intransitive
Antonym of 軟化
Noun
Suru Verb

3. upturn (in the market); firming up

Intransitive
Finance
Antonym of 軟化