a.

1. 勤勉的，刻苦的，不辞辛劳的
   She is making painstaking efforts to learn Chinese.

   她在刻苦学习中文。

   Harry is a painstaking student.

   哈里是个肯下苦功的学生。

2. 十分小心的；仔细的；煞费苦心的
   The picture has been cleaned with painstaking care.

   这幅画已被十分小心地擦干净了。

n.

1. 勤勉，刻苦；煞费苦心
   His painstaking to attain his goal in life is praiseworthy.

   他为实现人生目标所下的苦功是值得称赞的。

adj.