behaving in a proud, superior way; (of behaviour etc) showing too much pride in oneself and too little thought for others

having exaggerated self-opinion

daring (especially in a rude way)

reckless, daring

(especially of a young person) rude and not showing respect

impulsive, brazen

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

brash, unashamed

showing contempt

arrogant, insolent

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

feeling or showing no respect for sacred things

disrespectful

not showing proper respect

lively, bold

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

exceptionally smart, ahead of age in understanding

(of behaviour etc) too self-confident or arrogant

self-confident

(of a person, speech, behaviour) not showing respect or good manners; indecent; roughly made; simple

disrespectful, rough

not abashed

shameless

not afraid

fearless

snobbish

arrogant