How to say "inaccurate" in Japanese

• 不正確ふせいかくCommon
  na-adjective, nounCovers 'inaccurate' in the sense of factually wrong or imprecise: figures, measurements, or information that do not match the facts. This is the common word for that meaning.
  我々われわれの実験じっけんの結果けっか、彼かれの報告ほうこくは不正確ふせいかくなことがわかった。↗

  Our experiment has revealed that his report was inaccurate.
• 不明確ふめいかく
  na-adjective, nounGlossed 'inaccurate', but really means unclear, vague, or indistinct—a statement or description whose meaning is not clear. For factual inaccuracy it is seldom the word you want, and it is less common.
  それらの範囲はんいや形かたちは不明確ふめいかくである。↗

  Their scope and shape is unclear.

Use 不正確 for factual inaccuracy—wrong or imprecise figures, information, or statements; 不明確, though also glossed 'inaccurate', chiefly means unclear or vague, and is less common.

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

• 不正確ふせいかくinaccurate
• 不明確ふめいかくinaccurate