1. I had nine blissful hours of sleep.
    我无忧无虑地酣睡了九个小时。

2. We have blissful memories of a summer vacation.
    暑假里的快乐时光仍留在我们的记忆中。

1. 有福的：bliss 福佑 | blissful 有福的 | blissfully 幸福地

2. 充满喜悦的：blip 清脆的短音 | blissful 充满喜悦的 | blisteringragingrampantred-hotslapdashslashingswingeingtearing 猛烈的

3. 极快乐的,极幸福的：doughnut 炸面圈 | blissful 极快乐的,极幸福的 | giggle 咯咯地笑

4. 极幸福的：benign 慈祥的 | blissful 极幸福的 | blithe 快乐的,无忧无虑的

1. 极为高兴的；极乐的
    A blissful situation or period of time is one in which you are extremely happy.

    e.g. We spent a blissful week together...
           我们一起度过了非常快乐的一周。
    e.g. There''s just nothing more blissful than lying by that pool.
           没有比躺在那个泳池边更惬意的事情了。

2. （对不好或严重的事情）丝毫没有察觉的，毫不知情的
    If someone is in blissful ignorance of something unpleasant or serious, they are totally unaware of it.

blissful的反义词

    e.g. Many country parishes were still living in blissful ignorance of the post-war crime wave.
           庆幸的是，许多乡村教区仍然没有感受到战后的犯罪浪潮。

1. completely happy and contented

    e.g. blissful young lovers
           in blissful ignorance