vain/ven; veɪn/ adj 1 in vain without success 徒劳，无结果: Doctors tried in vain to save his life. 医生试图挽救他的生命，结果却回天乏术。 2 vain attempt/hope a vain hope or attempt is not successful or does not happen in the way that you want 徒劳的尝试/徒然的希望 3 having too much pride in yourself, your appearance, and your abilities 自负的，自视过高的: Men are so vain. 男人很自负。