How to say "conjecture" in Japanese

• 推測すいそくJLPT N1approx.Common
  suru verb, transitive verb, no-adjectiveThe closest general equivalent: a conclusion reached by reasoning from incomplete evidence, about facts, causes or outcomes. Use it for scientific, journalistic or everyday 'conjecture' and 'guess' in the intellectual sense.
  あなたも同どう意見いけんだと推測すいそくします。↗

  I gather you'll agree with me.
• 見当けんとうJLPT N3approx.Common
  nounCovers 'conjecture' only as a rough estimate: guessing an amount, a size or roughly where something is. Its separate sense 'aim' aside, it is not the word for reasoned conjecture.
  それがどこにあるのか、およその見当けんとうはついている。↗

  I have a rough idea where it is.
• 忖度そんたくCommon
  noun, suru verb, transitive verbConjecture here means surmising someone's feelings or intentions, often anticipating what they want without being told. It is not used for conjecture about facts, causes or outcomes.
• 察しさっしCommon
  nounAlso about reading people: sensing what someone feels or means from few words, and acting considerately on that. As 'conjecture' it stays within this interpersonal, empathetic guessing, never factual speculation.
  蓮れんくんは察さっしは良よい様ようだけど、もう少すこし心こころの機微きびというものを理解りかい出来できる様ように努力どりょくするべきじゃないかしら。↗

  You're considerate, but don't you think you should work a little more at understanding the subtleties of the human mind?
• 推察すいさつCommon
  noun, suru verb, transitive verbA surmise about another person's thoughts, feelings or circumstances; it overlaps with 推測 but leans toward reading minds rather than reasoning about external facts, matching English 'surmise' well.
  彼かれの表情ひょうじょうから本当ほんとうに怒おこっているのだと推察すいさつした。↗

  I gathered from his expression that he was very angry.

Choose 推測 for reasoned conjecture about facts or causes, 見当 for rough estimates of amount or direction, and 忖度, 「察し」 or 推察 when the conjecture is about someone's unspoken feelings or intentions.

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

• 推測すいそくguess
• 見当けんとうestimate
• 忖度そんたくsurmise (about someone's feelings)
• 察しさっしconsideration
• 推察すいさつguess
• 推量すいりょうguess
• 推し量るおしはかるto guess
• 予想よそうexpectation
• 計り知るはかりしるto conjecture
• 思議しぎconjecture
• 端倪たんげいconjecture
• 当て推量あてずいりょうconjecture
• 臆見おっけんconjecture
• 揣摩しまconjecture
• 憶断おくだんjumping to hasty conclusions
• 謬妄びゅうもうfallacy
• 当てずっぽうあてずっぽう(random) guess
• 憶説おくせつhypothesis
• 計るはかるto conjecture
• 推すおすto infer (from)