W: (adj) atypical [Indirect via typical] (not representative of a group, class, or type) "a class of atypical mosses"; "atypical behavior is not the accepted type of response that we expect from children"
S: (adj) authentic, bona fide, unquestionable, veritable (not counterfeit or copied) "an authentic signature"; "a bona fide manuscript"; "an unquestionable antique"; "photographs taken in a veritable bull ring"