adj. 痛苦的,（肉体）疼的,费力的，（工作）困难的,讨厌的，使人厌烦的
painful可以用作形容词
painful用作表语时,其主语不能是人。
painful用作形容词的用法例句
It was painful for him to renounce his son.宣布与儿子脱离关系对他来说是很痛苦的。
His wife's death left a painful void in his life.他妻子的死给他的人生留下了痛苦的空虚感。
The sting of a jellyfish is very painful.让水母刺着是很痛的。
1、Economic reform will continue to be painful and ineffective.
经济改革仍将举步维艰，毫无成效。
2、It is a painful experience having the boil lanced.
把疖子切开是很痛的。
3、He found the transition to boarding school excruciatingly painful.
他发现转到寄宿学校极其痛苦。