pernicious

Adjective
  1. Exceedingly harmful (synset 301615857)
    similar to: noxious - injurious to physical or mental health
    same as: baneful, deadly, pestilent
  2. Working or spreading in a hidden and usually injurious way (synset 301165950)
    "glaucoma is an insidious disease"; "a subtle poison"
    similar to: harmful - causing or capable of causing harm
    same as: insidious, subtle

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