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adjective

unstable

lacking stability or fixity or firmness

In a sentence

Six example sentences with unstable, each labelled with its topic.

  • The scaffolding sat on unstable fill, and inspectors halted the job until crews poured a proper concrete pad.

    Architecture

  • The isotope is unstable, shedding particles until it settles into a form that will sit unchanged for millions of years.

    Science

  • Standing on one leg on an unstable cushion trains the small ankle muscles that keep a runner upright on trails.

    Fitness

  • The coalition was unstable from the start, and the government fell after only seven months.

    Politics

  • The nightly build was unstable, crashing whenever two users opened the same file at once.

    Technology

  • The currency proved unstable through the summer, losing a tenth of its value one week and regaining it the next.

    Finance

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Found in these word lists

Found in 3 published word listsAuthoritative

Each source is a published word list that contains unstable. No exam board publishes an official GRE, GMAT or SAT list; GMAT words come from GRE lists and the Academic Word List.