could change suddenly without warning

volatile

adjective|/ˈvɑl.ə.təl/

Liable to change rapidly and unpredictably, especially for the worse.

Examples

In a meeting

The market is too volatile right now to make long-term commitments.

Over coffee

The weather has been volatile all week — sunshine one hour, storms the next.

Why this word

unstable

volatile emphasizes rapid and unpredictable changes or fluctuations, while unstable broadly lacks steadiness

unpredictable

volatile specifically indicates tendency toward sudden dramatic changes, while unpredictable means difficult to forecast

changeable

volatile stresses explosive or extreme variability, while changeable simply means subject to change

Usage tip

Implies instability and risk. Common with markets, situations, and personalities. Carries a warning tone.

Etymology

Latin volatilis — volare (to fly), literally 'able to fly away' — implying quick disappearance

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