真不像话. Well, this appears to be the relevant "口语” or 习惯用语 that finds its way onto the test that I find my way of never learning or paying much attention to.
It means outrageous, "scandalous", inappropriate, unreasonable. Really, it just sort of expresses a person's disapproval/disagreement of something.
Know it, but don't translate it back into English or into you head as these bizarre extreme words. If those words make sense in the context with the tone, then by all means. Otherwise take it about as seriously as someone saying "this is completely unacceptable" when all they really mean is 'that sucks' or 'that's really bad', etc.