心虚xīn xū 1.做错了事怕人知道{be afraid of being found out; with a guilty conscience}: 做贼～。{A thief is always afraid of being found out. or A thief is always nervous.} 2.缺乏自信心{lacking self-confidence; diffident}: 刚接手做生疏的工作,不免有点ㄦ～。{I've just taken over this new job and feel kind of diffident.}