不安定|ふあんていfuantei[2]nakadaka (mid-high)

1. na-adjective, nouninstability; insecurity; crankiness
   日本人にほんじんからが、アメリカ人あめりかじんは不安定ふあんていで、自由じゆう奔放ほんぽうに見みえる。↗

   Americans appear unsettled and uncontrolled to Japanese.

• Related危険きけんNeutralNeutral. Refers to danger or risk; 「不安定」 describes an unstable, changeable state that is not necessarily dangerous.
• Related危ういあやういNeutralNeutral. Suggests something is precarious and worrying, on the brink; 「不安定」 stresses swaying, unsteady movement.
• Related物騒ぶっそうNeutralNeutral. Describes unsafe conditions or a sense of danger, often about public safety; 「不安定」 is about unstable states or situations.
• RelatedやばいCasualColloquial slang for something bad or dangerous, and also for something amazing; 「不安定」 objectively describes instability.
• Related不確定ふかくていWrittenWritten/formal prose. Means not yet fixed or unclear; 「不安定」 refers to a state that easily changes.
• Related不安ふあんNeutralNeutral. Refers to inner worry or unease; 「不安定」 describes unstable states such as moods, situations, or income.
• Related無防備むぼうびNeutralNeutral. Means defenseless and open to attack or harm; 「不安定」 describes an unstable state.
• Related脆弱ぜいじゃくWrittenWritten/formal prose. Means fragile and unable to withstand shocks, as in 「脆弱な地盤」; 「不安定」 stresses fluctuation and unsteadiness.
• RelatedガタガタCasualColloquial onomatopoeia for rattling or wobbling, also used figuratively for an organization in disarray; 「不安定」 is the general term.
• Related剣呑けんのんWrittenWritten/formal prose for danger or unreliability; in everyday speech you would say 「危ない」 instead.
• Related宙ぶらりんちゅうぶらりんCasualColloquial. Means hanging in midair or left undecided; 「不安定」 covers instability in general.
• Related脆弱性ぜいじゃくせいWrittenWritten/formal prose noun for a weakness or system vulnerability; 「不安定」 describes an unstable state.
• Antonym安定あんていNeutralNeutral. Means stable and steady; the direct opposite of 「不安定」.
• Antonym安泰あんたいWrittenWritten/formal prose for peace and security, as in 「家内安泰」; the opposite of 「不安定」.

Use 「不安定」 for unstable situations, moods, or income. For inner worry choose 「不安」; for danger 「危険」 or 「危うい」; for fragility 「脆弱」. 「やばい」 is slang, 「宙ぶらりん」 means undecided, 「不確定」 not yet fixed, and 「安定」/「安泰」 are antonyms.

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

1. 安定あんていではないこと。