(さい)

さい
prefix
most; -est; utmost
See also: (さい) (re-; again)
1. most; -est; utmost
Prefix indicating the superlative degree.
This is the best movie.
(さい) + (こう) = highest/best
I started exercising recently.
(さい) + (きん) = most recent; lately
To assume the worst-case scenario.
(さい) + (あく) = worst

(さい)〜 is a superlative prefix equivalent to English '-est' or 'most.'

Compounds

Usage

(さい)〜 creates superlatives from sino-Japanese words. For native Japanese adjectives, use 一番(いちばん) (e.g., 一番(いちばん)(たか)).