Today's Word

Mercurial

mur-KYOOR-ee-uhl

Definition

(adjective) Subject to sudden or unpredictable changes of mood or mind.

Example

Her mercurial temperament made collaboration both exciting and exhausting.

Word Origin

Mid 17th century: from Latin mercurialis ‘relating to the god Mercury’, known for his speed and unpredictability.

Fun Fact

Mercurial originally referred to qualities associated with Mercury, the Roman messenger god—quick, clever, and elusive. Today, the word is often used to describe emotionally volatile people, though it can also apply to markets, creative energy, or political behavior. In psychology, a mercurial personality isn’t just moody—it’s brilliant, erratic, and hard to pin down.

Previous Words

Inimical

Today's Word

Inimical

ih-NIM-ih-kul

Definition

(adjective) Likely to cause harm or work against something; hostile and damaging to a person or cause.

Example

The startup’s chaotic management style proved inimical to creativity, driving away the very talent it needed most to survive.

Word Origin

Inimical derives from the Latin inimicalis, meaning “hostile” or “unfriendly,” rooted in inimicus — “enemy” — built from in- (“not”) and amicus (“friend”). It shares its ancestry with the word enemy, both tracing back to the same Latin root. It entered English in the 17th century, used to describe forces, conditions, or people that actively work against something rather than simply being indifferent to it.

Fun Fact

The Latin amicus — friend — sits at the root of a surprisingly large family of English words. Amiable, amicable, amity, and even amateur (originally meaning one who does something out of love) all share the same ancestor. Inimical is the dark twin of this family — the “un-friend,” so to speak — which makes it one of the rare words whose etymology tells you exactly what it means the moment you know its root. Linguists call this kind of transparent etymology a “motivated” word, where the meaning feels inevitable once the parts are understood.

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Mercurial

Definition

Example

Word Origin

Previous Words

Inimical

Inimical

Definition

Example

Word Origin

Inimical

Truculent

Obsequious

Abberation

Ubiquitous