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1
无用的, 无效的
lacking purpose or function, and unable to help in any way
- The broken watch was useless and couldn't tell time anymore.
坏掉的手表没用，再也无法显示时间了。
- His outdated skills were useless in the modern job market.
他过时的技能在现代就业市场上毫无用处。
- The expired medication was useless and had to be disposed of properly.
过期的药物无用，必须妥善处理。
- The faulty map was useless for navigation and led us astray.
有缺陷的地图对于导航毫无用处，并使我们误入歧途。
- His advice turned out to be useless and didn't solve the problem.
他的建议结果证明是无用的，并没有解决问题。
反义词：
2
无用的, 没用的
(of a person) failing to provide meaningful help or value in a given situation
- Despite being the project leader, Mark was completely useless during the meeting and didn't contribute any ideas.
尽管是项目负责人，马克在会议期间完全没用，没有贡献任何想法。
- She asked her brother to help assemble the furniture, but he turned out to be utterly useless and only got in the way.
她请她哥哥帮忙组装家具，但他却毫无用处，只会碍事。
- The consultant's advice was so generic and vague that it felt like hiring them was useless.
顾问的建议如此笼统和模糊，以至于感觉雇用他们是无用的。
- Whenever there's an emergency, John panics and becomes useless to the rest of the team.
每当有紧急情况时，约翰就会惊慌失措，对团队的其他成员变得无用。
- I expected Sarah to help me solve the issue, but her lack of effort made her seem totally useless in that situation.
我原本期望莎拉能帮我解决这个问题，但她缺乏努力让她在那情况下显得完全没用。
3
无用的, 徒劳的
incapable of serving any purpose or achieving a desired outcome
- Trying to grow tomatoes in this rocky soil is useless; nothing will thrive here.
尝试在这多石的土壤中种植西红柿是无用的；这里什么都不会茁壮成长。
- She made a useless attempt to convince her friends to join the party, but they had already made other plans.
她做了一个无用的尝试来说服她的朋友们参加聚会，但他们已经有了其他计划。
- He kept pressing the broken remote control, but it was completely useless—it wouldn't turn the TV on.
他不停地按着坏掉的遥控器，但它完全没用—它打不开电视。
- It's useless to try reasoning with someone who refuses to listen.
试图与拒绝倾听的人讲理是无用的。