安定|あんていantei[0]heiban (flat)

1. noun, suru verb, intransitive verbstability; steadiness; consistency; equilibrium; balance; composure
   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.
2. na-adjective, noun, suru verb, intransitive verb, physics, chemistrystable

• Synonym釣り合いつりあいNeutralBalance between two sides that match, as in 「釣り合いが取れる」; stresses things being well matched with each other, while 「安定」 describes a steady, unchanging state.
• Synonym均衡きんこうWrittenTwo or more things staying in balance with each other, as in 「需給の均衡」; written/formal prose. 「安定」 needs no two sides — it just means a steady state.
• Synonym平衡へいこうWrittenMostly physical or bodily balance, as in 「平衡感覚」; written/formal and technical. In everyday speech, 「バランス」 is the usual word.
• SynonymバランスNeutralThe most everyday word for balance or a well-matched mix, as in 「栄養バランス」; 「安定」 is about staying free of big change.
• Synonym安定性あんていせいNeutralThe degree or quality of being stable, used in evaluation, as in 「安定性が高い」; 「安定」 itself refers to the stable state.
• Synonym安定したあんていしたNeutralPrenominal form used to modify a noun, as in 「安定した収入」; synonymous with 「安定」 when that word is used attributively.
• Related兼ね合いかねあいNeutralWeighing several things against each other to keep a balance, as in 「予算との兼ね合い」; the focus is on trade-offs, while 「安定」 is about a state staying unchanged.
• Related安定化あんていかWrittenThe process of becoming or making something stable, as in 「経済の安定化」; written/formal prose. 「安定」 can refer to the state itself.
• Related均勢きんせいWrittenA rare written/formal word for a balance of power; everyday speech prefers 「勢力の均衡」. Close to 「安定」 only in the sense of balance.
• Antonym不安定ふあんていNeutralThe direct negation of 「安定」: unstable and prone to change. Also works as a na-adjective, as in 「情緒不安定」.
• Antonym混乱こんらんNeutralMajor disorder where order breaks down; the opposite of 「安定」 when discussing whether society or a situation is calm and settled.
• Antonym変動へんどうWrittenStates or figures moving up and down, as in 「価格変動」; written/formal prose. The opposite of 「安定」, which means no such change.

Use 「安定」 for a steady state with no big change. For balance, 「バランス」 is the everyday word and 「均衡」 the written/formal one; 「兼ね合い」 is for weighing trade-offs.

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

1. 物事ものごとが落ち着おちついていて、大おおきな変化へんかがないこと。またそのような状態じょうたいにすること。
2. 物もののすわりがよいこと。
3. 物質ぶっしつが化学かがく変化へんかを起おこしにくいこと。不活性ふかっせい。
4. 常つねに一定いっていの状態じょうたいを維持いじしており頼たよりになること。いつもどおりであること。定番ていばん。不動ふどう。