unstable

Describes something that is not stable, firm, or steady; likely to change or fail.

ruОписывает что-то, что не является стабильным, прочным или устойчивым; склонное к изменениям или сбоям.esDescribe algo que no es estable, firme o seguro; propenso a cambios, fallos o alteraciones.frQualifie quelque chose qui n'est pas stable, solide ou fiable ; susceptible de changer ou de tomber en panne.deBezeichnet etwas, das nicht stabil, fest oder dauerhaft ist; zu Veränderungen, Schwankungen oder Störungen neigend.ptDescreve algo que não é estável, firme ou seguro; que tende a mudar, oscilar ou falhar facilmente.zh形容某事物不稳定、不牢固或不可靠，容易发生变化、动摇或出故障。arيصف شيئًا غير ثابت أو غير متين أو غير مستقر، أو معرّضًا للتغيّر أو الاضطراب أو الخلل. ويُستعمل للدلالة على عدم الاستقرار في الحالة أو الوضع أو البنية.

1. Lacking stability or firmness B1 formal

   Not firmly fixed; likely to move, change, or fail.

   • The ladder felt unstable and I was afraid to climb it.
   • The political situation in the region remains unstable.
   • The patient's condition is still unstable after the surgery.

   ruНестабильныйesinestablefrinstabledeInstabilptInstávelzh不稳定的arغير مستقر

   同义词: insecureprecariousricketyrockyshakytotteryunsoundunsteadywobbly

   反义词: firmfixedsecuresolidstablesteady

2. Highly reactive B2 formal scientific

   Describing a chemical substance that is likely to react or decompose quickly.

   • This compound is highly unstable and must be stored carefully.
   • Unstable elements can cause dangerous reactions if mishandled.
   • The lab technician handled the unstable chemical with extreme caution.

   ruНестабильныйesInestable (en química)frinstable (chimie)deInstabilptInstávelzh不稳定的arغير مستقر كيميائياً

   同义词: labilereactivevolatile

   反义词: inertstable

3. Not reassuring B2 formal

   Causing worry or unease; not providing comfort or safety.

   • The economy is in an unstable state, causing anxiety among investors.
   • His unstable behavior at the meeting made everyone uncomfortable.
   • The building's unstable foundation gave little reassurance to the residents.

   ruНеуверенныйesInquietantefrqui inquiètedeBeunruhigendptInquietantezh令人不安的arغير مطمئن

   反义词: calmingreassuringsecurestablesteady

4. Severe mental illness C1 formal medical

   Suffering from a serious mental health condition that affects behavior and thinking.

   • The patient was diagnosed as mentally unstable and required constant care.
   • He was deemed unstable after the psychological evaluation.
   • The court ordered treatment for the unstable individual.

   ruПсихически нестабильныйesInestable mentalmentefrInstable mentaldePsychisch instabilptMentalmente instávelzh精神不稳定arغير مستقر نفسياً

   同义词: derangedinsanemadpsychoticunbalancedunhinged

5. Prone to psychological variability C1 formal

   Tending to have unpredictable or changeable moods and emotions.

   • She is emotionally unstable, often swinging from joy to sadness quickly.
   • His unstable temperament made it hard to maintain relationships.
   • The character in the novel is portrayed as psychologically unstable.

   ruНеустойчивыйesinestable emocionalmentefrinstable émotionnellementdeUnbeständigptInstávelzh情绪不稳定arغير مستقر نفسيًا

   同义词: capriciouschangeableerraticmercurialmoodytemperamentalunpredictablevolatile

   反义词: balancedcomposedequablelevelheadedstablesteady

6. Subject to change B2 formal

   Likely to change frequently; not constant or steady.

   • The weather in spring is often unstable, with sudden rain and sunshine.
   • The company's profits have been unstable over the past few years.
   • Her mood is unstable, shifting from cheerful to irritable without warning.

   ruНестабильныйesinestable, cambiantefrinstabledeInstabilptInstávelzh不稳定arغير مستقر

   同义词: changeableficklefluctuatingfluidinconstantmercurialmutableunsteadyvariablevolatile

   反义词: consistentconstantfixedinvariablestablesteadyunchanging

• more unstable comparative form
• most unstable superlative form