形容詞 unnecessary:

1. not necessary
   同義詞：unneeded

1. I'm sorry you've had a wasted (ie unnecessary, fruitless) journey.
   很遺憾你白跑了一趟。
2. I need hardly say (ie It is almost unnecessary for me to say) that I was very upset.
   無庸贅言，我心亂如麻。
3. Don't involve yourself in unnecessary expense.
   勿做不必要的花費。
4. It's very foolish of the commander to expose his men to unnecessary risks.
   這個指揮官讓士兵們冒不必要的危險真是太愚蠢了。
5. You shouldn't expose the soldiers to unnecessary risks.
   你不應該讓士兵們冒不必要的危險。
6. Don't burden yourself with unnecessary problems.
   勿為不必要的問題所累。
7. All this is totally unnecessary.
   所有這些完全都是多余的。