Q:

Is "much useful" correct usage?

How correct is this sentence:

Your advice isn't much useful

I couldn't really find it wrong however for some reason, it is not sounding right. The sentence "Your advice isn't very userful." seems much more fluent.
So is the phrase much useful grammatically correct?
Many Thanks
PS: I am learning English and would appreciate if someone could point/correct any mistakes in my question.  

A:

'Much' is a quantifier for mass (non count) nouns.
'Many' is a quantifier for plural (count) nouns.
'Very' is an intensifier for adjectives.
'Use' is a verb or noun.  'Useful' is an adjective.  'Usefulness' is a noun.
So "your advice isn't [of] much use", or "your advice isn't very useful."

