How to say "consistency" in Japanese

• 安定あんていJLPT N3approx.Common
  noun, suru verb, intransitive verbCovers consistency as steadiness or lack of fluctuation, close to 'stability'. Best for things like performance, quality, or supply that stay reliably even over time rather than for logical coherence.
  今日きょうの政治せいじ状況じょうきょうはそれほど安定あんていしていない。↗

  The current political situation is not very stable.
• 徹底てっていJLPT N3approx.Common
  noun, suru verb, transitive verb, intransitive verbReally means thoroughness or carrying something out completely; 'consistency' here is marginal. Choose it when the point is doing something without exception, not when you mean evenness or coherence.
  生産性せいさんせいはオートメーションの徹底てっていによって向上こうじょうする。↗

  Production improves by becoming more automatic.
• 一貫いっかんCommon
  noun, suru verb, transitive verb, intransitive verbThe usual word for consistency in behavior, attitude, or policy over time—being consistent in what you do or say. Used adverbially in the sense of 'consistently' throughout a period.
  その学校がっこうは、中ちゅう・高こう一貫校いっかんこうだということを頭あたまの片隅かたすみにでも入いれておいて下ください。↗

  Bear in mind that that school is an integrated junior high and high school.
• つじつまJLPT N1approx.Common
  nounRefers to the coherence or consistency of an account, story, or explanation—whether the details hang together. Common in phrases about a story being inconsistent; not for consistency of behavior or quality.
  統計とうけいの数字すうじを理論りろんとつじつまの合あうように変かえる。↗

  I accommodate statistics to theory.
• 一致いっちJLPT N3approx.Common
  noun, suru verb, intransitive verbCovers consistency as agreement or correspondence between two or more things, such as data, testimony, or results matching. It is about things agreeing at a point in time, not steady behavior over time.
  凶器きょうきに残のこされた指紋しもんは容疑者ようぎしゃのものと一致いっちする。↗

  The fingerprints left on the weapon correspond with the suspect's.

Pick by sense: 一貫 for acting consistently over time, 一致 for agreement between things, 「つじつま」 for a story holding together, 安定 for steadiness, and 徹底 mainly for thoroughness rather than consistency.

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

• 安定あんていstability
• 徹底てっていthoroughness
• 一貫いっかんconsistency
• つじつまcoherence
• 一致いっちagreement
• まとまりunity
• 一貫性いっかんせいconsistency
• コンシステンシconsistency
• 稠度ちょうどconsistency
• 無矛盾性むむじゅんせいconsistency (of an axiomatic system)
• 平仄ひょうそくmeter (in Chinese poetry)
• 整合性せいごうせいintegrity
• 首尾貫徹しゅびかんてつ(logical) consistency
• 帳尻ちょうじりconsistency
• インテグリティintegrity