painless

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

1. requiring little hard work or exertion (Freq. 1)
- a painless solution to the problem
• Similar to:
easy
2. not causing physical or psychological pain
- painless dentistry
• Ant:
painful
• Similar to:
pain-free, unpainful
• See Also:
harmless