become pessimistic and world-weary ❍ 否则单作肚皮的奴隶，即使不至～，也必感人生的空虚。(叶圣陶《倪焕之》129) He would simply be a slave to his belly,and even if he never went so far as to become a world-weary pessimist,he would still not be able to help feeling that life is vain and worthless.
悲观厌世bēi ɡuān yàn shì
形容对生活失去信心，萎靡不振，厌弃人世。lose one’s belief and be pessimistic, become pessimistic and world-weary