What is the difference between "固い" and "硬い"?

"固い" means "hard; firm; solid; stiff" (N4), whereas "硬い" represents "hard, solid, firm, tough, stiff" (N3).

Kanji Homophone Battle

Pronunciation Trap: "かたい (katai)"

Same sound, completely different Kanji! Choose the right conceptual writing.

Kanji Option A

かたい (katai)

N4 / CEFR

Kanji Option B

かたい (katai)

N3 / CEFR

In Japanese, many words share the exact same pronunciation "かたい (katai)" but are written with different Kanji, changing the meaning entirely.

固い (Level: N4): Translates to "hard; firm; solid; stiff" and is used when I-adjective. Describes something physically hard to break, or firm. For N4, it commonly refers to physical hardness..
硬い (Level: N3): Maps to "hard, solid, firm, tough, stiff" and carries the nuance of Describes the physical property of being firm or difficult to break/bend. Can also be used metaphorically for things being rigid, serious, or strict.

Mixing these up can easily result in unnatural writing. Look at the bilingual context cards below to master the conceptual boundaries!

Bilingual Context for "固い"

このパンは焼きたてなのに、少し固い。

This bread is freshly baked, but a little hard.

Bilingual Context for "硬い"

このパンは少し硬い。

This bread is a little hard.

Which Kanji perfectly fits this blank space?

Which Kanji perfectly fits the blank: "このパンは焼きたてなのに、少し＿＿＿。" (Meaning: "This bread is freshly baked, but a little hard.")

🎉 Correct Answer!

Correct! "固い" is used for "hard; firm; solid; stiff" in the context: "This bread is freshly baked, but a little hard.".