Yes, glib is a Scrabble word!
...and is worth 7 points in Scrabble, and 10 points in Words with Friends
glib
Adjective
1. Marked by lack of intellectual depth
2. Having only superficial plausibility
3. Artfully persuasive in speech
What Scrabble words can I make with the letters in glib?
3 Letter Words
2 Letter Words