Correct

无痛

/ wú tòng /
Strokes

Example

As an Adjective

painless

1
guāng
激光
zhìliáo
治疗
yǎnshāng
眼伤
jiǎn
简易
érqiě
而且
tòng
无痛
  

Laser treatment of eye injuries is simple and painless.