Tā zǒngshì dài zhe yī zhǒng mòmíng de yōuyuègǎn kàndài tārén.
He always looks at others with an inexplicable sense of superiority.
Tips
usage
优越感 has a slightly negative connotation in Chinese - it implies arrogance or condescension. It is distinct from 自信 (self-confidence), which is positive.