There is no prefix for with, not even a suffix.
No, awfully does not have a prefix. It would be aw, but that is not a recognizable prefix.
A prefix would be In- for incapacitated.
the prefix would be -an and the suffix would be -aemia
the prefix is the first part of a word so for injustice( In) would be the prefix
One prefix would be impolite.
One prefix would be meso
No, the word "help" does not have a prefix. It is a standalone word.
One prefix would be "im", as in impersonal.
One prefix would be un-, as in unimaginable.
The antonym prefix for "capable" is "in." An example would be "incapable."
The prefix you would use for "appoint" is "re-."
One prefix would be impolite.