He's good fun: Is GOOD here the adverb?

[abc]

Hi teachers

He's great. He's good fun.
Is good here the adverb?
Does he's good fun mean he's very fun?

Thanks

abc

[Conchita]

[Yankee]

Hi abc

Just to add to what Conchita wrote, I'd say the word fun is used as a noun in your sentence, so good is (and is used as) an adjective.

If you want to use an adverb in the sentence, then you could write (e.g.):

He's tremendously good fun.

Amy

[Conchita]

Thanks, Amy, for completing my answer. It looks as if I had missed abc's first question (which I must have, too!). My absent-mindedness is going from bad to worse!