July 07, 2019
Learner's Word of the Day
unstable /ˌʌnˈsteɪbəl/ adjective
unstable
/ˌʌnˈsteɪbəl/
adjective
An old, unstable barn that looks ready to fall down
An old, unstable barn that looks ready to fall down
Learner's definition of UNSTABLE

[more unstable; most unstable]

a : likely to change

  • unstable prices

  • unstable weather

b : not emotionally or mentally healthy

  • She is emotionally/mentally unstable.

c : not held in a secure position : likely to move or fall

  • an unstable tower/ladder

d technical : having a chemical structure or physical state that changes easily

  • an unstable nuclear reactor core

  • an unstable element

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