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Definition of: insidious
(in·sid′ē·əs) adjective
1. Designed to entrap; full of wiles.
2. Doing or contriving harm.
3. Awaiting a chance to harm.
4. Causing harm by slow, stealthy, usually imperceptible means; an insidious disease. [<L insidiosus <insidiae ambush <insidere sit in, lie in wait]
—in·sid′i·ous·ly adverb
—in·sid′·i·ous·ness noun Synonyms: artful, crafty, cunning, deceitful, designing, guileful, intriguing, sly, subtle, treacherous, tricky, wily.
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