Today's Word

Mercurial

mər-KYUR-ee-uhl (or mur-KYOOR-ee-uhl)

Definition

(adjective) Subject to sudden or unpredictable changes of mood or mind; volatile, capricious.
Relating to the Roman god Mercury (or the planet Mercury), often implying qualities of cleverness, eloquence, or swiftness.

Example

Her mercurial temperament made her both exhilarating and exhausting to work with; one moment she was full of boundless enthusiasm, and the next, stormy and withdrawn.

Fun Fact

The word “mercurial” is derived from the Roman god Mercury, who was known for his speed, wit, and trickery. Mercury was also the messenger of the gods, and his unpredictable nature made him a fitting inspiration for the term. In alchemy, “mercurial” also refers to mercury (quicksilver), a liquid metal known for its fluid and volatile properties, reinforcing the word’s association with changeability. Over time, “mercurial” evolved to describe not only physical but also emotional and mental shifts, making it a vivid way to characterize people with ever-changing moods.

Previous Words

Vaunt

Today's Word

Vaunt

VAWNT

Definition

(verb/noun) To boast about or praise something excessively, especially one’s own achievements or qualities.

Example

The company’s much-vaunted innovation strategy had produced exactly one product in three years — a fact the press release somehow failed to mention.

Word Origin

Vaunt derives from the Old French vanter, meaning “to boast,” from the Late Latin vanitare — from vanus, meaning “empty” or “vain.” The same root gives us vanity, vain, and vanish — all words built around emptiness or the illusion of substance. It entered English in the 15th century, used to describe the kind of boasting that draws attention to itself precisely because what lies beneath it cannot support the weight of the claim being made.

Fun Fact

The most celebrated vaunter in English literature is almost certainly Sir John Falstaff — Shakespeare’s magnificently self-aggrandizing knight whose vaunting bears no relationship whatsoever to his actual military record. In Henry IV Part 1, Falstaff claims to have fought off eleven men in buckram single-handedly, a number that grows with each telling until Prince Hal quietly deflates the entire account. Shakespeare used Falstaff’s vaunting to make a precise point about the relationship between self-promotion and reality — that the volume of a boast is often inversely proportional to the substance behind it, a principle that has lost none of its relevance in the six centuries since.

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Mercurial

Definition

Example

Previous Words

Vaunt

Vaunt

Definition

Example

Word Origin

Vaunt

Hauteur

Acrimonious

Bathetic

Welter