from an answer on ell.stackexchange.com:

If "much" qualifies a simple adverb or a simple adjective, you can use it in a negative sentence:
(1) He is not much good. — OK

The word "simple" makes the rule very bad and unclear because it's not understood what "simple" means.
Is the past participle adjective "disappointed" considered simple or not?

for example:
(2) She didn't look much disappointed.
Is (2) correct?

Also I wonder whether adding "very" would change the correctness of the sentences:
(1a) He is not very much good.
(2a) She didn't look very much disappointed.
Are (1a) and (2a) correct?

from an answer on ell.stackexchange.com:

If "much" qualifies a simple adverb or a simple adjective, you can use it in a negative sentence:
(1) He is not much good. — OK

The word "simple" makes the rule very bad and unclear because it's not understood what "simple" means.
Is the past participle adjective "disappointed" considered simple or not?

for example:
(2) She didn't look much disappointed.
Is (2) correct?

P.S.: I know I can say (1) and (2) with "very":
(1a) He is not very good. — correct
(2a) She didn't look very disappointed. — correct

Also I wonder whether adding "very" to "much" would change the correctness of the sentences or not:
(1b) He is not very much good.
(2b) She didn't look very much disappointed.
Are (1b) and (2b) correct?