How to say "confirm" in Japanese

• ただすCommon
  godan verb, transitive verbCovers confirming or verifying something — making sure of the facts. It can suggest probing a matter to establish the truth, and is usually written in kana.
  校長こうちょうは彼かれに無断欠勤むだんけっきんの理由りゆうをただした。↗

  The principal called him to account for being absent without an excuse.
• 見定めるみさだめるCommon
  ichidan verb, transitive verbLeans toward discerning or making a settled judgment about what something is — grasping the nature of a thing by watching it closely. For plain 'confirm this fact' it is seldom the word you want.
• 確かめるたしかめるJLPT N3approx.Common
  ichidan verb, transitive verbA common, general-purpose word for 'confirm' or 'make sure': checking that something is the case. Use it when you want to verify a fact or detail before going ahead.
  窓まどが閉しまっているか確たしかめとけ。↗

  See that the window is closed.

For everyday 'confirm' or 'make sure', 「確かめる」 is the default; 「ただす」 suits verifying the truth of a matter, while 「見定める」 is for discerning or settling what something is rather than confirming.

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

• ただすto ascertain
• 見定めるみさだめるto make sure of
• 確かめるたしかめるto make sure
• 聞きただすききただすto find out the truth
• 結ぶむすぶto close (e.g. deal)