| in.sid.i.ous aj \in-'sid-e-*s\
[L insidiosus, fr. insidiae ambush, fr. insidere to sit in, sit on,
fr. in- + sedere to sit -- more at SIT]
1 a : awaiting a chance to entrap TREACHEROUS
b : harmful but enticing SEDUCTIVE
2 a : having a gradual and cumulative effect SUBTLE
b of a disease
: developing so gradually as to be well established before
becoming apparent
in.sid.i.ous.ly av
in.sid.i.ous.ness n
|