Word · CEFR A2 · Frequency #3637
unnecessary
不必要的；不需要的
Not needed; not necessary.
- 1.
Not needed or necessary.
- 2.
not necessary
不必要的
- 3.
Done in addition to requirements; unrequired.
多余的；非必需的；不必要的
In use
We should avoid unnecessary risks when driving at night.
The report was full of unnecessary details that made it hard to read.
Please don't make any unnecessary noise in the library.
it is unnecessary to do sth
常用于引导不定式短语。
It is unnecessary to worry about the outcome.
没有必要担心结果。
unnecessary for sb/sth
表示对某人或某物而言不必要。
This warning is unnecessary for experienced users.
这个警告对有经验的用户来说没有必要。
unnecessary + noun
直接修饰名词，表示多余的。
Connections
Collocations
- unnecessary expense
- 不必要的开支
- We should avoid any unnecessary expense during the project.在项目期间，我们应该避免任何不必要的开支。
- unnecessary risk
- 不必要的风险
- Don't take unnecessary risks when driving in bad weather.在恶劣天气驾驶时不要冒不必要的风险。
- unnecessary trouble
- 不必要的麻烦
- She went to great lengths to save him unnecessary trouble.她尽力避免给他带来不必要的麻烦。
- unnecessary delay
- 不必要的延误
- Please proceed without unnecessary delay.请立即进行，不要有不必要的延误。
- unnecessary complication
- 不必要的复杂化
- We should simplify the process and avoid any unnecessary complication.我们应该简化流程，避免任何不必要的复杂化。
Learner notes
Memory Tip
前缀un-像'不'，所以unnecessary = '不必要'，记住这个前缀就能记住。
Context & Register
通常用于正式或中性语境，如学术写作、商务沟通和日常对话，不带有强烈的褒贬色彩。
Grammar Note
常与不定式连用，表示‘做某事是不必要的’。
Pronunciation & Spelling
All listed words share the '-ary' spelling ending, but stress patterns differ, so they do not rhyme with unnecessary (stress on second syllable). The closest sound is 'necessary', but it has first-syllable stress.
High-value vocabulary
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Usage priority
Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.