noun
looking back; worry about the future; anxiety over what one leaves behind
Almost always appears in the phrase 後顧の憂い (こうこのうれい), meaning 'anxiety about what one leaves behind' or 'future worries'. Rarely used outside this fixed expression.
後顧の憂いなく新しい仕事に専念できる。
I can devote myself to the new job without any worries about what I'm leaving behind.