Today's Word

Enmity

EN-muh-tee

Definition

(noun) Deep-seated hatred or hostility between people or groups.

Example

Years of competition had grown into open enmity, making cooperation nearly impossible.

Word Origin

From Latin inimīcitia, meaning “hostility,” related to inimīcus (“enemy”).

Fun Fact

In literature, enmity often signals a conflict that runs deeper than simple disagreement—it’s the simmering force behind famous rivalries like Montagues vs. Capulets or Holmes vs. Moriarty. Psychologists note that prolonged enmity can reshape group identity: people begin defining themselves by who they oppose. The word captures not just anger, but the enduring emotional landscape that turns opposition into something personal and lasting.

Previous Words

Efficacious

Today's Word

Efficacious

ef-ih-KAY-shus

Definition

(adjective) Capable of producing the desired result; successful in achieving the intended outcome.

Example

The new treatment proved remarkably efficacious in clinical trials, reducing symptoms in over ninety percent of patients within the first two weeks.

Word Origin

Efficacious derives from the Latin efficax, meaning “powerful” or “effectual,” rooted in efficere — “to bring about” or “to accomplish” — built from ex- (“out”) and facere (“to make” or “to do”). The same root gives us effect, efficient, and efficacy — a family of words all built around the idea of something being done and producing a result. It entered English in the 16th century, used predominantly in medical and philosophical contexts to describe remedies or arguments that actually worked.

Fun Fact

The history of medicine is largely a history of distinguishing the efficacious from the merely plausible. For centuries, bloodletting was considered one of the most efficacious treatments available — practiced by physicians from ancient Greece through the 19th century for conditions ranging from fever to mental illness. George Washington died in 1799 partly as a result of aggressive bloodletting performed by his own doctors in response to a throat infection. It wasn’t until the rise of controlled clinical trials in the 20th century that medicine developed reliable tools for separating treatments that actually worked from treatments that merely seemed to — a distinction efficacious had been waiting two thousand years for medicine to catch up with.

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Enmity

Definition

Example

Word Origin

Previous Words

Efficacious

Efficacious

Definition

Example

Word Origin

Efficacious

Penurious

Unctuous

Adumbrate

Lurid