noun, na-adjective, noun which may take the genitive case particle 'no'
outrageous; arrogant; acting as if no one else matters
Describes behavior that is brazen, insolent, or completely disregarding of others, as if no one else were present. Often used as a strong criticism.
彼の傍若無人な態度には本当に腹が立つ。
His arrogant attitude really makes me angry.
電車の中で大声で電話するなんて、傍若無人だ。
Talking loudly on the phone on the train is just outrageous.