深い, ふかい
Conjugated: 深さ
Antonym: 浅い・1
1. deep
2. profound
3. dense, thick
4. close (relationship)
5. intense, strong
その湖の深さはどのくらいですか。
は
Particle, pronounced わ in modern Japanese
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis