Translation

非の打ち所がない / 異議の余地がない / 申し分のない

Meaning

Unexceptionable means acceptable and not giving any reasonable cause for objection. It is a formal praise word, but usually quiet praise: nothing is wrong with it. Do not confuse it with unexceptional, which means ordinary or not special.

Examples

• 彼女の経歴は申し分なく、委員会はすぐに承認しました。
  Her qualifications were unexceptionable, and the committee approved her quickly.
• 提案の文言は異議の余地がないものでした。
  The wording of the proposal was unexceptionable.