不履行|ふりこうfurikou[2]nakadaka (mid-high)

1. noundefault; nonperformance

• SynonymデフォルトNeutralLoanword for defaulting on a debt; it also means a default setting, a sense common in IT that 「不履行」 never has.
• Related滞納たいのうNeutralOverdue payment of money owed, e.g. 「家賃の滞納」; it centers on falling behind with dues such as rent or taxes.
• Related未払いみはらいNeutralMeans simply not having paid, e.g. 「代金の未払い」; it applies only to money owed, while 「不履行」 covers nonperformance of any obligation.
• Related未納みのうNeutralNot having paid what is due, e.g. 「年金未納」; it focuses on the unpaid dues themselves, unlike the broader 「不履行」.
• Antonym履行りこうNeutralPerformance or fulfillment of a duty or promise; the direct antonym of 「不履行」.
• Antonym実行じっこうNeutralExecution or carrying out of a plan or action; an antonym of 「不履行」.
• Antonym完遂かんすいNeutralCarrying a task through to the very end; an antonym of 「不履行」 that stresses successful completion.

Use 「不履行」 for failing to honor a promise or contractual duty, as in 「債務不履行」 and 「契約不履行」. For financial default say 「デフォルト」, for falling behind on payments 「滞納」, for unpaid money 「未払い」; the antonym is 「履行」.

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

1. しなければならない約束やくそくや契約けいやくを行おこなわないこと。