- 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) Health-giving; promoting well-being.
The mountain air was so salubrious that even a short stay left them feeling refreshed and energized.
From Latin salubris, meaning “healthful,” related to salus, or “health.”