mid-15c., "unlucky," from un- (1) "not" + fortunate (adj.). Infortunate in same sense is from late 14c. (along with a verb infortune "to render unhappy"). In late 18c.-early 19c., unfortunate woman was a polite way to say "prostitute." The noun meaning "one who is not fortunate" is recorded from 1630s.
实用例句
1. Through some unfortunate accident, the information reached me a day late.
由于发生了不幸的意外，我知道消息的时候已经晚了一天。
来自柯林斯例句
2. Every year we have charity days to raise money for unfortunate people.
每年我们都有慈善日来筹款帮助贫困人群。
来自柯林斯例句
3. It really is desperately unfortunate that this should have happened just now.
刚才竟发生这样的事儿，实在是太不合时宜了。
来自柯林斯例句
4. Some unfortunate person passing below could all too easily be seriously injured.
从下面经过的倒霉蛋儿很容易受重伤。
来自柯林斯例句
5. By an unfortunate oversight, full instructions do not come with the product.
