理亏心虚

道理欠缺，心里就害怕。亏：欠缺。

理亏心虚lǐ yú xīn xū

have a guilty conscience;be inwardly guilty; know that justice is not on one’s side; feel that one is not on solid ground; with one’s self-confidence crumbling (/sinking/striking)
❍ 他诬告了你，自然～。Naturally he is feeling apprehensive because he is not on solid ground after he has lodged a false accusation against you.

理亏心虚lǐ kuī xīn xū

比喻理由站不住脚，心里发虚。have a guilty conscience, have compunctions, become scared, with one’s self-confidence shrinking