unfortunate
词根词缀：
词根
fort= luck 运气
fortuitous adj. 偶然的
fort〔= fortu〕运气 + itous → 靠运气 → 偶然的
fortune n. 运气；财富
fort 运气 + une → 运气带来财富 → 运气；财富
misfortune n. 不幸
mis 坏 + fortune 运气；财富 → 不幸
unfortunate adj. 不幸的
un 不 + fortunate 幸运的 → 不幸的
数据来源：新东方英语词汇速记大全
相关例句：
I had an unfortunate discovery today.
我今天很不幸的发现了一件事情。
Which is unfortunate for me, because I am in love with you.
这对我来说很是不幸，因为我爱上你了。
Your best course of action is to forget about the whole unfortunate matter.
你最佳的做法就是忘掉这整个不幸的事件。
A beautiful girl has often an unfortunate life.
红颜多薄命。
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。
He was one of the dirtiest little unfortunate I ever saw.
我难得看见这样脏的一个小可怜。