If you describe something as unnecessary, you mean that it is not needed or does not have to be done. 不必要的
adjective [原级] 不必要的；多余的，无用的
The slaughter of whales is unnecessary and inhuman. 对鲸的屠宰是不必要且不人道的。
- unnecessary 出现在下面的课文中（提供视频、音频及笔记等可系统性学习）
- Lesson 54 Instinct or cleverness?
- 网友用 “Unnecessary” 造句精选
- I hate unnecessary waste. 我憎恨不必要的浪费。
- That last comment was a little unnecessary, wasn't it? 那最后一点评论有点多余，不是吗？