insidious
(ɪnˈsɪdɪəs)
adj.
a : awaiting a chance to entrap
b : operating or proceeding inconspicuously but with grave effect
c : stealthily treacherous or deceitful
adj.
a : awaiting a chance to entrap
b : operating or proceeding inconspicuously but with grave effect
c : stealthily treacherous or deceitful