Synonyms of insidious in English:

insidious

adjective

  • the insidious erosion of rights and liberties
    stealthy, subtle, surreptitious, sneaking, cunning, crafty, Machiavellian, artful, guileful, sly, wily, tricky, slick, deceitful, deceptive, dishonest, underhand, backhanded, indirect
    informal sneaky
    [Antonyms] straightforward
  • Definition of insidious in:

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    Word of the day noisome
    Pronunciation: ˈnɔɪs(ə)m
    adjective
    having an extremely offensive smell