速い
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Base i-adjective form ending in 『い』. Describes high speed or quickness in movement or action.
Theme
Two friends, Ken and User, are at a park discussing their morning jogging routines and how fast they can run.
速い
はやい
fast / quick
Core Language Building BlocksCore Adjectives
Memory Hook
Think of a speedy car racing past. You shout, 『速い！』 (hayai, 'fast') — 'Hay-ai!' sounds like 'hey, I'm fast!'
Cultural Note
『速い』 (hayai) is often used to describe speed in sports, transportation, or technology. For example, 『新幹線は速い』 (shinkansen wa hayai, 'The bullet train is fast').
Forms
Base: 速いBase i-adjective form ending in 『い』. Describes high speed or quickness in movement or action.
Negative: 速くないDrop 『い』 → add 『くない』 (kunai, negative) → 『速くない』 (hayakunai).
Past: 速かったDrop 『い』 → add 『かった』 (katta, past) → 『速かった』 (hayakatta).
Adverbial: 速くDrop 『い』 → add 『く』 (ku, adverbial) → 『速く』 (hayaku). Used to modify verbs, e.g., 『速く走る』 (hayaku hashiru, 'run fast').
Comparative: より速いComparative formed with modifier 『より』 (yori, 'more than') + base adjective.
Superlative: 一番速いSuperlative formed with 『一番』 (ichiban, 'number one / Most') + adjective.