- Today's Word
Pernicious
per-NISH-us
Definition
(adjective) Causing harm in a gradual or subtle way.
Example
Unchecked misinformation can have a pernicious effect on public trust.
Fun Fact
Back in the 15th century, pernicious was a word used to describe deadly disease or outright destruction—especially during outbreaks and plagues. But over time, its meaning shifted from the obvious to the insidious. Today, it’s used to describe things like toxic relationships, systemic inequality, or manipulative rhetoric—all of which may not seem dangerous at first, but quietly cause real harm over time.
(adjective) Eager to argue or fight; aggressively defiant and quick to confront.
The truculent customer refused every solution the staff offered, seeming more interested in the argument itself than in any actual resolution.
Truculent comes from the Latin truculentus, meaning “fierce” or “savage,” derived from trux meaning “wild” or “cruel.” It entered English in the 16th century, initially describing something literally savage or brutal, before settling into its modern meaning of aggressive confrontational behavior and a hair-trigger readiness to fight or argue.