painless [ˈpenlɪs]

例句:

• Other ideas in the pipeline include painless ultrasonic injections.
  来自BBC
• There are no easy or painless solutions to the nation's economic ills.
  这个国家的经济弊病没有轻松便捷的解决办法。
  
• Acupuncture treatment is gentle, painless, and, invariably, most relaxing.
  针灸疗法柔和，无痛，而且总是令人非常放松。
  
• House-hunting is in fact relatively painless in this region.
  在这个地区找房子事实上相对比较容易。
  
• My mother claims that his was a painless birth.
  来自T. Watada
• Donating is relatively painless, contrary to popular belief.
  来自WSJ