変則|へんそくhensoku[0]heiban (flat)

1. na-adjective, no-adjectiveirregularity; anomaly

• Synonym不規則ふきそくNeutralNo set pattern or rhythm, as in 「不規則な生活」. Focuses on irregular routines or shapes rather than breaking a rule.
• SynonymイレギュラーNeutralLoanword for something irregular or unconventional; common in everyday talk about schedules or work arrangements. Also an irregular bounce of a ball (bad hop).
• Related異例いれいNeutralExceptional or unprecedented, as in 「異例の抜擢」. Stresses rarity, not violation of a rule.
• Related変則的へんそくてきNeutralNa-adjective meaning not conforming to the usual way, as in 「変則的な日程」; 「変則」 itself can also serve as a noun or na-adjective, so the meanings are close.
• Antonym正則せいそくNeutralAntonym: regular, proper and conforming to the rules — the opposite of the rule-defying 「変則」.

Use 「変則」 for departures from the norm or official rules, as in 「変則的な日程」 and 「変則ダブルス」. Pick 「異例」 for rare, exceptional cases, 「不規則」 for things with no set pattern, colloquial 「イレギュラー」 for everyday irregularity, and 「正則」 as the antonym.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 規則きそくや規定きていされていることから外はずれていること。