This phrase is worth
noting precisely because it does not belong in this dictionary: it makes sense in a moral universe
that has utterly vanished. The last "cad and bounder" died, perhaps, about 1947 (see London Daily Telegraph obituaries for further evidence).
Although they are appropriately
linked, the precise meanings
differ. A "cad" is one who does harm to a woman's honor or sense of self-worth
as, for example, by taking her for a garden walk
when he has no intention of marrying her. A "bounder" is a presumptious
upstart, seemingly ignorant of, but perhaps merely indifferent
to, fundamental norms of propriety.