perpetual
adjective uk/pəˈpetʃ.u.əl/ us/pɚˈpetʃ.u.əl/
永久的，永恒的;长期的
continuing for ever in the same way
They lived in perpetual fear of being discovered. 他们长期生活在恐惧中，担心被发现。
He has hard, cold eyes and his mouth is set in a perpetual sneer. 他双眼又凶又冷，嘴角总是挂着一丝蔑笑。
a perpetual student 终生学习者
不断重复的;永无休止的
often repeated
perpetual vandalism 对公共财物不断的蓄意破坏