(often brazen-faced) (of a bad person, bad behaviour) without shape

brash, unashamed

bold and courageous or adventurous

adventurous

showing or deserving derision

ridiculing

impolite (the usual word)

rude, impolite

not showing deserved respect

irreverent

a flat limb of certain sea animals (not fish) used in swimming; a similar device, usually of rubber, worn on the feet to aid swimming

bold, shameless

very rude, disrespectful

bold, shameless

insulting; rude

bold, disrespectful

not showing proper respect

lively, bold

(of a person) having developed intelligence earlier that is normal

exceptionally smart, ahead of age in understanding

scornful; cynical

sarcastic