insidious
I
adjective
artful, beguiling, cheating, conniving, covinous, crafty, cunning, deceitful, deceiving, deceptive, designing, devious, dishonest, disloyal, dolosus, ensnaring, fallax, false, false-hearted, foxy, fraudulent, furtive, guileful, hypocritical, inconstant, indirect, insidiosus, intriguing, lying, perfidious, plotting, scheming, serpentine, sly, stealthy, subtle, surreptitious, treacherous, tricky, underhanded, unscrupulous, vulpine, wily
II
index
bad (offensive), collusive, contemptible, covert, deceptive, detrimental, devious, dishonest, disingenuous, fraudulent, furtive, harmful, illusory, lawless, machiavellian, perfidious, pernicious, recreant, sinister, sly, surreptitious, untrue, untrustworthy
Burton's Legal Thesaurus.
William C. Burton.
2006