I knew that he was a fickle man, and one you could never rely on.

我知道他是个反复无常的人，你绝不能依赖他。

youdao

Be good, is a kind heart; Do good man is a fickle face.

做好人，靠的是一颗善良的心；做老好人靠的是一张善变的脸。

youdao

The fickle, unsteady mind, so hard to guard, so hard to control the wise man straightens, as the fletcher the arrow.

动摇的、轻燥的心，难防护、难抑制；智者（实）行正值，如矢师矫正箭直。

youdao

But the fickle Thai press, which had only weeks earlier voted Tarrin "Man of the Year, " rounded on the finance minister and his boss, Chuan.

CNN: THE FEUDING MINISTERS