unaccustomed

形容词 unaccustomed:

1. not habituated to; unfamiliar with
2. not customary or usual

1. Is still unaccustomed to a life of stress.
   仍然无法适应充满压力的生活
2. I felt giddy from the unaccustomed exercise.
   我因不习惯的运动而晕眩。