overt UK /ə(ʊ)ˈvɜːt/US /oʊˈvɚt/adjective 2noun 1forms 1 adjective2 •Open and not concealed or secret. •Disclosed.Arg. an eagle rising wings overt inverted sa. armed or. HILTOFTE, V. — 1874 noun1 •An action or condition said to be detrimental to one’s own survival and thus unethical; the consciousness of such behaviour.Scientologists are sure that the person must have “overts” against Scientology, therefore nothing a former member says can be trusted. — 1990 formsoverts