深い
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Base i-adjective form ending in 『い』. Describes physical depth (e.g., water) or abstract depth (e.g., meaning).
Theme
Two friends, Ken and User, are hiking in a forest and discussing the scenery around a lake they encounter.
深い
ふかい
deep / profound
Core Language Building BlocksCore Adjectives
Memory Hook
Imagine a deep ocean where you can't see the bottom. You dive in and feel the depth, saying 『深い！』 (fukai, 'deep'). 'Fukai' sounds like 'fook-eye' — you need a deep look to see it!
Cultural Note
In Japanese culture, 『深い』 (fukai) is often used metaphorically to describe profound emotions, thoughts, or relationships, such as in poetry or literature, reflecting depth beyond the physical.
Forms
Base: 深いBase i-adjective form ending in 『い』. Describes physical depth (e.g., water) or abstract depth (e.g., meaning).
Negative: 深くないDrop 『い』 → add 『くない』 (kunai, negative) → 『深くない』 (fukakunai).
Past: 深かったDrop 『い』 → add 『かった』 (katta, past) → 『深かった』 (fukakatta).
Adverbial: 深くDrop 『い』 → add 『く』 (ku, adverbial) → 『深く』 (fukaku).
Comparative: より深いComparative formed with modifier 『より』 (yori, 'more than') + base adjective.
Superlative: 一番深いSuperlative formed with 『一番』 (ichiban, 'number one / Most') + adjective.