not firmly fixed or not constant; liable to change or break, mentally ill or disturbed

Formal and Informal Expressions of unstable

In different contexts, you can replace 'unstable' with suitable alternatives. In a more formal setting, 'insecure, volatile' is apt. In informal speech or writing, 'shaky, iffy' is a commonplace synonym.

unstable: Explore its Definition & Usage

unstable Definition

1not firmly fixed or not constant; liable to change or break
2mentally ill or disturbed

Using unstable: Examples

Take a moment to familiarize yourself with how "unstable" can be used in various situations through the following examples!

Example
The political situation in the country is very unstable.
Example
The patient's condition is still unstable.
Example
The economy is becoming increasingly unstable.

unstable Synonyms and Antonyms

Synonyms for unstable

Antonyms for unstable

Phrases with unstable

emotionally unstable
having moods that are unpredictable and changeable
Example
She was emotionally unstable after the breakup.
unstable relationship
a relationship that is not steady or secure
Example
Their relationship was very unstable and they broke up after a few months.
unstable personality
a personality that is not consistent or predictable
Example
He has an unstable personality and can be difficult to work with.

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Summary: unstable in Brief

The term 'unstable' [ʌnˈsteɪbl] refers to something that is not firmly fixed or constant, and can change or break easily. It can also refer to someone who is mentally ill or disturbed. Examples include 'The political situation in the country is very unstable,' and 'The patient's condition is still unstable.' Phrases like 'emotionally unstable' and 'unstable relationship' denote unpredictability and inconsistency.