permanent
uk
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/ˈpɜː.mə.nənt/us
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/ˈpɝː.mə.nənt/ B1 adjective lasting for a long time or for ever: She is looking for a permanent place to stay. 她正在寻找一个固定的住所。
ageless
uk
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/ˈeɪdʒ.ləs/us
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/ˈeɪdʒ.ləs/ adjective Someone or something that is ageless never looks older. She is beautiful and, at 43, somehow ageless. 她虽然已经43岁了，但仍然很美，而且不知怎么地，总也不显老。
eternal
uk
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/ɪˈtɜː.nəl/us
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/ɪˈtɝː.nəl/ adjective lasting forever or for a very long time: The company is engaged in the eternal search for a product that will lead the market. 该公司一直在寻找可以引领市场的产品。
everlasting
uk
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/ˌev.əˈlɑː.stɪŋ/us
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/ˌev.ɚˈlæs.tɪŋ/ adjective lasting forever or for a long time: I wish someone would invent an everlasting light bulb. 我希望能有人发明一种永远不会烧坏的灯泡。
perpetual
uk
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/pəˈpetʃ.u.əl/us
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/pɚˈpetʃ.u.əl/ adjective 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。
timeless
uk
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/ˈtaɪm.ləs/us
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/ˈtaɪm.ləs/ adjective Something that is timeless does not change as the years go past. The city has a timeless quality as if it had existed forever. 该市具有一种永恒的品质，似乎它亘古以来就存在。
timeless
uk
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/ˈtaɪm.ləs/us
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/ˈtaɪm.ləs/ adjective having a value that is not limited to a particular period but will last for ever: a timeless book/play/film/classic 一部流传百世的书／戏剧／电影／经典作品
undying
uk
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/ʌnˈdaɪ.ɪŋ/us
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/ʌnˈdaɪ.ɪŋ/ adjective literary Undying feelings or beliefs are permanent and never end: He pledged undying love/loyalty. 他发誓他的爱／忠诚至死不渝。
changeless
uk
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/ˈtʃeɪndʒ.ləs/us
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/ˈtʃeɪndʒ.ləs/ adjective literary used to describe something that never seems to change: Surrounded by this changeless landscape, one can imagine the world as it was many thousands of years ago. 置身于这永恒不变的风景之中，可以想象出好几千年前世界是什么样子的。
immutable
uk
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/ɪˈmjuː.tə.bəl/us
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/ɪˈmjuː.t̬ə.bəl/ adjective formal not changing, or unable to be changed: an immutable law 永恒的法则