na-adjective, noun
Describes an arrogant, condescending attitude or behavior; often used with 態度 or 物言い.
彼の権高な態度には腹が立つ。
His haughty attitude is infuriating.
あの人はいつも権高に振る舞う。
That person always acts arrogantly.
The exact derivation is uncertain. The kanji 権 (authority, power) and 高 (high) suggest a sense of 'high-handed authority', fitting the meaning of haughtiness.