in a way that makes you feel very sad and without hope, or that shows someone is sad and without hope

Day and night the sirens screamed dismally. 日日夜夜，警笛声凄厉地尖叫着。

"I'll never get over this," he said dismally. 他沮丧地说：我永远无法克服这个问题。

in a way that is very bad

Their attempts failed dismally. 他们的尝试惨告失败。

I was excited to read this novel, but I was dismally disappointed. 这本小说我原来很想读，但其内容令我失望极了。