well what you are asking IS lying. "Answering questions without actually answering them" is lying. Lying is giving false data.
Without examples it's hard for me to understand
consider it misdirection of sorts..... giving false answers is called lying... giving obfuscated or ambiguous answer is not exactly lying...
If your world view is black and white, then everything is truth or lie and nothing in betweens... else there can be states between truth and lie.....
equivocations can be considered a part of it...
Politicians do it all the time.... it is a great tool to create public opinion on something.....
lets say someone ask you
"why did you buy brandy?"
and you answer
"for medicinal purpose"
the person will automatically assume that you need it to deal with common cold or something....
whereas drinking can be considered "therapeutic"....
you did not exactly lie, the purpose was medicinal..... believe me, downright lying can be detected but giving half truth or equivocations are easier and more convincing..
have you read "Macbeth"?
the conversation between the witches and Macbeth is an example..
EDIT : Another example...
say, a kid asks you "what is sex"....
you say without missing a beat :- " it is a kind of a dance"
you did not exactly lie did you? it IS a dance where 2 people come close, interlock their limbs and move their body in a rhythm.... trying to explain or lie can cause trouble..