I feel keenly that my ability falls short of my wishes.

我深感力不从心。

《新英汉大辞典》

We are keenly aware of what it feels like to cry, of the suffering we feel in our face after many expressions of agony and sadness.

我们敏锐地意识到想要哭的感觉，在痛苦和悲伤在我们脸上展现时我们遭受的苦难。

youdao

She herself saw to our food and clothing and all other wants, and kept us constantly near, so that we might not feel our loss too keenly.

她亲自照料我们的饮食衣着以及其他一切日常需要，不断亲近我们，好让我们不至于对母亲的亡故感到过于痛苦。

youdao

They feel keenly the slights, and worse, faced by kinsfolk in countries such as Slovakia, where Hungarians number 500, 000, or 10% of the population.

ECONOMIST: Hungary and Slovakia

It is Mr Mandelson's loss as an adviser and back-stiffener that Mr Blair will feel more keenly.

ECONOMIST: Politics

It will no doubt seem odd to some readers and viewers that so many people could feel so keenly the death of someone they never met.

FORBES: Why Steve Jobs mattered