To be conceited and arrogant despite possessing no real talent or knowledge; haughty and overbearing, yet devoid of true ability.
他总是对别人的工作指手画脚，但自己却拿不出任何实际成果，真是空腹高心啊。
He always criticizes others' work but can't produce any practical results himself, truly a case of being haughty despite lacking real ability.
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