1.  uncertain
2.  fugacious
3.  fugitive
4.  short-lived
5.  fungal

• 1. 无常的: uncertain | ficklea | fungal | changeable
• 2. 反复无常的: capricious | volatile | erratic | whimsical
• 3. 喜怒无常的: temperamental | moody | mercurial | The capricious

更多释义

• 1.他次年陪那个情绪反复无常的女演员去了好莱坞。
  He accompanied the volatile actress to Hollywood the following year.
  dict.yoduao.com
• 2.把他们称作一群懵懂无知、喜怒无常的孩子是冤枉了他们。
  Calling them a bunch of capricious kids with half-formed ideas does them an injustice.
  dict.yoduao.com
• 3.她对我们的失败和反复无常的耐心，以及她给我们第二次机会的意愿，让我们每天都学会感恩。
  Her patience with our failings and fickleness and her willingness to give us a second chance are a daily lesson in gratitude.
  dict.yoduao.com

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