Student Dictionary

One entry found for insidious.
Main Entry: in·sid·i·ous
Pronunciation: in-primarystresssid-emacron-schwas
Function: adjective
1 a : awaiting a chance to trap : TREACHEROUS <an insidious foe> b : harmful but attractive <an insidious habit>
2 : having an effect that develops gradually <an insidious disease>
- in·sid·i·ous·ly adverb
- in·sid·i·ous·ness noun

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