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Definitions

insidious

[in-sid-ee-uhs] / ɪnˈsɪd i əs /
ADJECTIVE
sneaky, tricky
Synonyms
STRONGEST
dangerous subtle
WEAK
Machiavellian artful astute corrupt crafty crooked cunning deceitful deceptive deep designing dishonest disingenuous duplicitous ensnaring false foxy guileful intriguing like a snake in the grass perfidious perilous secret slick sly smooth snaky sneaking stealthy surreptitious treacherous wily wormlike
Antonyms
WEAK
fair honest open sincere

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Mitrokhin claimed the experience opened his eyes to the insidious nature of the entire system.

From The Wall Street Journal

“Wildfire is insidious. It doesn’t stop at the fence line.”

From Los Angeles Times

More insidious groupthink has taken hold inside the NFL: only quarterbacks can win the league’s Most Valuable Player award.

From The Wall Street Journal

"Crucially", he said, it would also test whether the law can keep up with insidious, emerging forms of stalking, including those carried out online or using "new technology".

From BBC

In fact, it makes that damage more insidious.

From Salon

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.