defiant UK /dɪˈfaɪ(j)ənt/US /dɪˈfaɪənt/adjective 2noun 1forms 3 adjective2 •Defying. •Boldly resisting opposition. noun1 •One who defies opposition.Countries condemning South Africa, Portugal and Rhodesia still find it necessary to trade with these defiants against so-called world opinion. — 1966 formsdefiants · more defiant · most defiant