I thought I was having technical problems with this BLOG site. And, because I didn't have enough sleep or enough to occupy my compulsive little brain, I repeatedly visited and revisited the templates, posts and profile to stress over whether anything had been lost or broken with the site. I ended up reading everything I've written -- and found I use this word too much. Time to break out the Thesaurus!

From the following: Merriam-Webster Dictionary Free, and Corporate Core Value-Approved.

Main Entry: in·sid·i·ous
Etymology: Latin insidiosus, from insidiae ambush, from insidEre to sit in, sit on, from in- + sedEre to sit -- more at SIT
Date: 1545
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 adverb
- in·sid·i·ous·ness noun

Synonyms SLY 2, artful, astute, crafty, cunning, deep, foxy, guileful, tricky, wily
Related Word perfidious, treacherous; dangerous, perilous; gradual, subtle