insidious definition, insidious meaning | English dictionary

Collins

insidious

  

      adj  
1    stealthy, subtle, cunning, or treacherous  
2    working in a subtle or apparently innocuous way, but nevertheless deadly  
an insidious illness     
     (C16: from Latin insidiosus cunning, from insidiae an ambush, from insidere to sit in; see insessorial)  
  insidiously      adv  
  insidiousness      n  
English Collins Dictionary - English Definition & Thesaurus  
Collins

insidious

  
  
artful, crafty, crooked, cunning, deceitful, deceptive, designing, disingenuous, duplicitous, guileful, intriguing, Machiavellian, slick, sly, smooth, sneaking, stealthy, subtle, surreptitious, treacherous, tricky, wily  
  
Antonyms     
   artless, conspicuous, forthright, harmless, honest, ingenuous, obvious, open, sincere, straightforward, upright  

English Collins Dictionary - English synonyms & Thesaurus  

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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"