規則的 (kisokuteki) Japanese meaning: systematic | KotomoraHe goes to the gym regularly.
Leading a regular lifestyle is good for your health.
Opposites
規則的 means following a regular, predictable pattern, the opposite of ランダム's lack of pattern or order.
規則的 describes something following a fixed, predictable pattern, the direct opposite of 不規則's lack of order.
Etymology
Formed from 規則 (rule, regulation) + 的 (-like, -ic), a common pattern for creating adjectival nouns.