Puzzle #6: Which word is the odd one out, and why? WIN 2 TOKENS!

FOR SUBSCRIBERS ONLY!.........

All these words have a connection except one which is not quite like the rest. Which is it, and what's the difference?

The first reply, without any corrections, wins!

Please note: There must be a correct explanation for your choice to win the tokens.

Good luck. :o)

* vague
* infamous
* mean
* untidy
* salty
* skip
* boiling
* strange
* internal
* silent
* nonchalant
* crowded