1. insidiously

adverb. in a harmfully insidious manner.


  • -ly (English)
  • -lice (Old English (ca. 450-1100))
  • insidious (English)
  • insidiosus (Latin)

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Example sentences of the word insidiously

1. Adverb
More insidiously, a smoke alarm may fail silently if a large power surge damages the wiring in such a way as to prevent the warning beeps.