Definitions

mercurial

[mer-kyoor-ee-uhl] / mərˈkyʊər i əl /

ADJECTIVE

flighty, temperamental

Synonyms

STRONGEST

changeable effervescent erratic impulsive resilient unpredictable volatile

WEAK

blowing hot and cold bubbleheaded buoyant capricious elastic expansive fickle flaky flip fluctuating gaga gay inconstant irregular irrepressible lighthearted lively lubricious mad mobile movable quicksilver spirited sprightly ticklish unstable up-and-down variable yo-yo

Antonyms

STRONGEST

certain constant predictable reliable stable steady sure unchanging

WEAK

calm tranquil unchangeable unperturbable unvarying

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.

Your first chance to see whether mercurial French forward Kylian Mbappé, the world’s best player, is paying full attention this year.

From Salon • Jun. 11, 2026

The trial also showed Musk’s volcanic temper and mercurial side.

From The Wall Street Journal • May 16, 2026

But it will have its work cut out to placate the mercurial Republican.

From Barron's • Apr. 28, 2026

Chelsea's Cole Palmer showed his quality with a goal in the Euro 2024 final in Berlin and has the sort of mercurial talent that could give England an X-factor in the World Cup.

From BBC • Apr. 1, 2026

Kendra relished being part of the mercurial procession, overjoyed at the fortunate ending to the terrible night.

From "Fablehaven" by Brandon Mull

Vocabulary lists containing mercurial

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