instability

noun

in·​sta·​bil·​i·​ty ˌin(t)-stə-ˈbi-lə-tē 

: the quality or state of being unstable

especially : lack of emotional or mental stability

Synonyms of instability

• unsteadiness
• precariousness
• unstableness
• insecurity

Examples of instability in a Sentence

Investors are worried about the current instability of the stock market.

The patient has a history of emotional instability.

Recent Examples on the Web

Massive disruptions and price instability are forcing businesses to make impossible decisions. — David Goldman, CNN Money, 20 Sep. 2026

Yet after this rapid expansion, any potential slowdown in AI demand growth, or efficiency gains that reduce data center power requirements, could introduce significant instability into power grid operations. — CNBC, 18 Sep. 2026

And while suspension can imply inaction, Agada views it instead as a state of change; a space where instability and possibility can coexist. — Kristen Tauer, Footwear News, 18 Sep. 2026

There’s economic instability, job insecurity, fear about AI and what the future holds. — Howard Cohen, Miami Herald, 17 Sep. 2026

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for instability

• affability
• audibility
• bistability
• capability
• changeability
• contractility
• credibility
• culpability
• disability
• disutility
• durability
• fallibility

Kids Definition

instability

noun

in·​sta·​bil·​i·​ty ˌin(t)-stə-ˈbil-ət-ē 

: the quality or state of being unstable

Medical Definition

instability

noun

in·​sta·​bil·​i·​ty ˌin(t)-stə-ˈbil-ət-ē 

plural instabilities

: the quality or state of being unstable

especially : lack of emotional or mental stability