Meaning of the Sanskrit Word: duhkhena

  duhkhena—by unhappiness    SB 6.14.39
  duhkhena—with difficulty    SB 3.30.2
  duhkhena—by miseries    Bg 6.20, Bg 6.21, Bg 6.22, Bg 6.23, Bg 6.20-23

Can't find any compound Sanskrit words containing duhkhena.