a contradiction between earlier and later statements; an inconsistency or self-contradiction in reasoning or explanation.
彼の説明は前後矛盾していて、誰も納得できなかった。
His explanation was self-contradictory, and nobody could be convinced.
契約書の条項が前後矛盾しているため、法務部に確認を依頼した。
Because clauses in the contract contradicted each other, I asked the legal department to check it.
記事の前半と後半で主張が違い、前後矛盾になっている。
The article's claims differ between the first and second halves, creating a contradiction.