In Images^x, Hyphens^x

I can't find a source that explains what I thought I understood many years ago. The question deals with joining an adverb and an adjective with a hyphen before the noun, but not afterward: the freshly-cut lawn smells great ~ the lawn is freshly cut he is a highly-admired...

Hi Hanuman, 1. Nitin( name of a boy) is very rude to other children. I have to change this sentence using "well-behaved" a) Nitin is not well-behaved. b) Nitin is not well behaved. My question is "shall I use hyphen or not?". Yes, use it. You might want to say Nitin...