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

Despite a strong growth forecast for the region, unemployment among the fast-growing youth population remains stubbornly high, leading to political instability and leaving the authorities looking for ways to create more jobs. — Martin K.n Siele, semafor.com, 30 Oct. 2026

During the discussion, attendees and panelists highlighted severe housing instability among airport staff, noting that several workers are unhoused and sleep in their vehicles or inside the terminal between shifts. — Chase Jordan october 30, Charlotte Observer, 30 Oct. 2026

But another harsh swing in the United States’ approach to China would create more policy instability while also discounting the extent to which Beijing’s rise is transforming the geopolitical balance. — Ali Wyne, Foreign Affairs, 29 Oct. 2026

Try not to decide immediately that change equals instability. — Tarot.com, Hartford Courant, 28 Oct. 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