I feel unworthy of the precious gift you have bestowed on me.

厚赐受之有愧。

《新英汉大辞典》

MY OWN HUSBAND, - Let me call you so - I must - even if it makes you angry to think of such an unworthy wife as I.

我自己的丈夫，——让我这样称呼你吧——我一定要这样称呼你——即使这会使你想起我这个不值得做你妻子的人而生气，我也要这样称呼你。

youdao

If he did, I am sorry. I never told him how sorry I was, how unworthy I was, how I regretted it.

假如他知道这一切，我现在感到很遗憾，因为我从没告诉过他我是多么愧疚、多么不孝、多么悔恨。

youdao

When I find a man who is not willing to bear his share of the burdens of the government which protects him, I find a man who is unworthy to enjoy the blessings of a government like ours.

FORBES: Some Presidential Words On Federal Income Taxes

But such transparency would go astray when others saw us out of context or when I gave trust to those few who were unworthy of it.

NPR: McChrystal Takes Blame For Rolling Stone Article

When Swartz was indicted in July 2011, I recalled reading about but his case and found it unworthy of blogging about here.

FORBES: Aaron Swartz Hacker Case Ends With Suicide