How to say "assume" in Japanese

• 決め込むきめこむCommon
  godan verb, transitive verbCovers 'assume' as taking something for granted or jumping to a conclusion. Use it when someone decides on their own that something is so, without checking the facts.
• 就くつくJLPT N3approx.Common
  godan verb, intransitive verbCovers 'assume' in the sense of taking up a seat, position, or office, as in 'assume office' or 'assume a post'. For that sense it is the verb to reach for.
  友人ゆうじんの好意こういで職しょくに就つくことができた。↗

  I was able to get a job through the good offices of my friend.
• 思い込むおもいこむJLPT N2approx.Common
  godan verb, intransitive verbCovers 'assume (that)': being convinced or under the impression that something is true. The nuance is a firm, settled belief that may well turn out mistaken.
  彼かれが僕ぼくにそう思い込おもいこませたのです。↗

  He put the idea into my head.
• 座るすわるJLPT N5approx.Common
  godan verb, intransitive verbPrimarily means to sit; its 'assume' sense is limited to taking or occupying a position or post, so it is seldom the word you want for 'assume' except in that seat-related use.
• 負うおうJLPT N1approx.Common
  godan verb, transitive verbCovers 'assume' in the sense of taking on responsibility, blame, or costs. Use it when someone accepts and carries an obligation or burden that rests on them.
  これについては私がすべて責任せきにんを負おいます。↗

  I will accept full responsibility for this.

Choose by sense: 「決め込む」 and 「思い込む」 for assuming something is true, 「就く」 and 「座る」 for assuming a post or position, and 「負う」 for assuming responsibility, blame, or costs.

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

• 決め込むきめこむto take for granted
• 就くつくto take (seat, position, course, office, etc.)
• 思い込むおもいこむto be convinced (that)
• 座るすわるto assume (a position)
• かぶるto bear (e.g. someone's debts, faults, etc.)
• 負うおうto take (responsibility)
• 呈するていするto assume (e.g. a shape)
• 任ずるにんずるto assume (responsibility)
• 任じるにんじるto assume (responsibility)
• 呈すていすto assume (e.g. a shape)
• ものとするto assume
• 騙るかたるto misrepresent oneself as
• 出るでるto assume (an attitude)
• 決めるきめるto take for granted
• 冒すおかすto assume (someone else's surname)
• 採るとるto assume (an attitude)
• とするto suppose that (such) is the case