Detailed vs Lengthy

When to use each in English, with meaning, register, and examples.

Detailed

Top 2,000 (common)B2adjective

Lengthy

Top 1,000 (very common)C1adjective
Most common: Lengthy
 DetailedLengthy
Pronunciation🇬🇧 /["/ˈdiːteɪld/"]/🇺🇸 /["/ˈdiːteɪld//dɪˈteɪld/"]/🇬🇧 /["/ˈleŋkθi/"]/🇺🇸 /["/ˈleŋkθi/"]/
MeaningIncluding many small parts or facts.very long; taking a lot of time or space
ExampleThe report provided a detailed analysis of the data trends.lengthy delays
RegisterNeutralNeutral
How commonTop 2,000 (common)Top 1,000 (very common)
CEFR levelB2C1
Part of speechadjectiveadjective
Collocationsbe, seem, extremely, fairly, verybe, extremely, fairly, very
Antonymssimple, basic, generalbrief, short, concise
Common mistakesUsing 'detailled' instead of 'detailed'., Confusing 'detailed' with 'demanding' or 'complicated'., Omitting the noun after 'detailed', making the phrase incomplete.Confused with 'long' which can describe physical length, while 'lengthy' describes duration or detail., Used inappropriately for short items, where a term like 'brief' would be better., Assuming 'lengthy' can describe anything; usually it pertains to processes or texts.
Usage notesUse 'detailed' when you want to describe something that contains a lot of information. It is appropriate in both written and spoken contexts, particularly in formal reports or extensive descriptions. Avoid using it in casual conversations where simplicity is preferred.Use 'lengthy' to describe something that is longer than usual, such as a speech or a document. It is suitable for both written and spoken language but may come off as slightly formal in casual conversations.

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Detailed

Frequently asked questions: Detailed vs Lengthy

What's the difference between Detailed and Lengthy?

Detailed: Including many small parts or facts. Lengthy: very long; taking a lot of time or space

Which is more common: Detailed and Lengthy?

Lengthy is the most common in everyday English.

Which is more advanced: Detailed and Lengthy?

Lengthy is the highest level, at C1, on the CEFR scale.

Are Detailed and Lengthy the same CEFR level?

Detailed: B2, Lengthy: C1 on the CEFR scale.

What part of speech are Detailed and Lengthy?

Detailed: adjective, Lengthy: adjective.

Can you show an example of each?

Detailed: The report provided a detailed analysis of the data trends. Lengthy: lengthy delays

Can I use Detailed and Lengthy interchangeably?

Not always. Detailed and Lengthy are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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