她说自己很快活，但是她的笑容很勉强。

She said she was enjoying herself but her smile was forced.

《牛津词典》

我们厌恶眼前的任务，感到很勉强。

We resent the task in front of us. We feel imposed upon.

youdao

希腊以及现在的爱尔兰迫使他们很勉强地出资援助。

Greece and now Ireland have forced them, reluctantly, into bail-outs.

youdao

If it's a stretch for you, I still recommend that you do it.

如果你觉得很勉强，我仍建议你一起来。

哈佛公开课 - 幸福课课程节选

She's speaking reluctantly here.

她说这些话很勉强。

耶鲁公开课 - 弥尔顿课程节选