Here's the WT standard for lying:
"While malicious lying is definitely condemned in the Bible, this does not mean that a person is under obligation to divulge truthful information to people who are not entitled to it" - Insight pp. 244-245
vs. Websters Dictionary:
LIE, noun
1. A criminal falsehood; a falsehood uttered for the purpose of deception; an intentional violation of truth.
Watchtower seems to say that it is OK to lie as long as it is not "malicious". Of course, the liar gets to decide if he is malicious or not.