Both of these adjectives -- more similar in the Greek than they sound in translation -- have the same root: the verb o)/zw, I smell, and the prefix dus-, with notion of hard, bad, unlucky, difficult. See generally LSJ s.v. For the headword cf. beta 593, gamma 426, kappa 147, phi 641. (For the gloss see delta 1672.)
The word is common in medical literature, with reference to breath or body fluids. For an "active" meaning of the prefix dus-, see Xenophon, Cynegeticus [On Hunting] 5.3: oi( o)/mbroi [...] th\n gh=n poiou=si du/sosmon; "the rains make the ground hard [sc. for dogs] to smell"; cf. Pollux 5.12.
Also in Hesychius s.v. (but with the neuter form instead of the masculine).