pain的形容词形式：painful：adj.令人疼痛的;令人痛苦(或难过、难堪)的;不愉快的;困难的;艰难的

pain：n.(身体上的)疼痛;痛苦;苦恼;烦恼;讨厌的人(或事);v.使痛苦;使苦恼

例句：

My ankle is still too painful to walk on.

我的脚腕子还是疼得不能走路。

He died a slow and painful death.

他缓慢而痛苦地死去。

Every move was painful.

每动一下都很痛。

A wasp or bee sting is painful but not necessarily serious.

被黄蜂或蜜蜂蜇一下疼是疼，但未必碍事。

The divorce was painful and messy.

那次离婚令人痛苦而又纠葛不清。