WORD OF THE DAY
If something is slowly and secretly causing harm, it's insidious — like the rumors no one seems to listen to until suddenly someone's reputation is ruined.
Insidious is related to the Latin noun, īnsidiae meaning "ambush" which comes from the Latin verb, īnsidēre "to lie in wait for." This is very fitting as an insidious rumor or problem is one whose negative effect is not realized until the damage is already done. Similarly, an insidious disease develops internally without symptoms, so that you don't realize right away that you are sick.
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Commonly confused words with insidious
insidious / invidious
Neither insidious nor invidious are happy words: insidious describes something that lies in wait to get you, and invidious is something offensive or defamatory. Cancer can be insidious, lurking in your body without your knowing it. Invidious doesn’t hide; it’s hateful right away.
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Learn these essential words that you'll encounter in literature, textbooks, class discussions, and more.
Looking to build your vocabulary? Then practice this list of 300 "hard words" — the kind that used to be tested on the SAT before 2016. If you're a high school student prepping for the SAT, check out Vocabulary.com's Roadmap to the SAT, which focuses on the vocabulary you'll need to ace today's SAT test.
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