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Definitions

temperamental

[tem-per-uh-men-tl, -pruh-men-, -per-men-] / ˌtɛm pər əˈmɛn tl, -prəˈmɛn-, -pərˈmɛn- /
ADJECTIVE
moody; irritable
Synonyms
STRONGEST
capricious erratic excitable fickle headstrong high-strung impatient irritable mercurial moody ornery passionate petulant thin-skinned unpredictable unreliable unstable volatile
WEAK
changeable cussed easily upset emotional explosive fiery froward hotheaded hyper hypersensitive in bad mood inconsistent mean neurotic sensitive ticklish touchy uncertain undependable variable willful
Antonyms
STRONGEST
calm constant dependable easygoing happy laid-back predictable reliable stable steadfast steady tolerant unchanging unvarying
WEAK
peaceful pleased

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.

An example he cited was Puerto Rico, a U.S. territory beleaguered by a temperamental power grid and excluded from congressional and presidential elections.

From Los Angeles Times • Apr. 3, 2026

"It's an economic landscape that is completely temperamental," said Anna Barker, co-founder of the firm.

From BBC • Feb. 19, 2026

"But young stars are so extremely spotty, active, and temperamental, that the Doppler method is a non-starter."

From Science Daily • Jan. 31, 2026

Netflix has appealed to investors over the past decade precisely because it has been able to focus on streaming without the baggage of managing a declining cable-TV business and dealing with a temperamental theatrical market.

From The Wall Street Journal • Jan. 21, 2026

You may indeed call it a temperamental difference, but I venture we are talking about something rather more.

From "The Remains of the Day" by Kazuo Ishiguro

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.