See Also: insidious(medicine)
insidious(dictionary)
insidious(dictionary)

insidious (oh)



[Date: 1500-1600; Language: Latin; Origin: insidiosus, from insidiae 'attack from a hiding-place', from insidere 'to sit on, lie in wait', from sedere 'to sit']
an insidious change or problem spreads gradually without being noticed, and causes serious harm
::an insidious trend towards censorship of the press
-- insidiously adv
-- insidiousness n [U]