WordNet sense 1 (with no effort to conceal):

bald

WordNet sense 2 (open and observable; not secret or hidden):

open, overt

WordNet sense 3 (unrestrained by convention or propriety):

audacious, bodacious, brassy, brazen, insolent, brazen-faced, bald-faced

WordNet sense 4 (used of persons or their behavior; feeling no shame):

unashamed