na-adjective, noun
unaware; unconscious; oblivious
Describes a state of being unaware of one's own actions, feelings, or situation, often with a nuance of lacking self-reflection.
彼は自分の欠点に無自覚だ。
He is unaware of his own shortcomings.
無自覚な発言が相手を傷つけることもある。
Unconscious remarks can sometimes hurt others.
自覚 means self-awareness or consciousness of one's own situation; 無自覚 is its direct antonym.
Compound of 無 (mu, 'without') and 自覚 (jikaku, 'self-awareness').