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Definitions

instability

[in-stuh-bil-i-tee] / ˌɪn stəˈbɪl ɪ ti /
NOUN
imbalance, inconstancy
Synonyms
STRONGEST
anxiety fluctuation insecurity uncertainty volatility vulnerability weakness
STRONG
alternation capriciousness changeability changeableness disequilibrium disquiet fickleness fitfulness flightiness fluidity frailty hesitation immaturity impermanence inconsistency inquietude irregularity irresolution mutability oscillation pliancy precariousness restlessness shakiness transience unpredictability unreliability unsteadiness vacillation variability wavering
WEAK
unfixedness
Antonyms
STRONG
calm
WEAK
balance constancy soundness stability steadfastness

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In quantum systems, that instability is known as "noise."

From Science Daily • Apr. 6, 2026

The moment sparked a broader conversation about the realities of working actors’ lives, and the instability that often comes with careers in entertainment.

From Salon • Apr. 4, 2026

Quantum stocks were notoriously volatile long before the recent bout of market instability.

From Barron's • Mar. 30, 2026

Excessive power and instability go hand in hand.

From The Wall Street Journal • Mar. 30, 2026

There was an instability in the upper atmosphere.

From "The London Eye Mystery" by Siobhan Dowd