Intensive vs Thorough

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

Intensive

Top 2,000 (common)C1adjective

Thorough

FormalBeyond 10,000 (less common)B2adjective
Most formal: ThoroughMost common: Intensive
 IntensiveThorough
Pronunciation🇬🇧 /["/ɪnˈtensɪv/"]/🇺🇸 /["/ɪnˈtensɪv/"]/🇬🇧 //ˈθʌrə//🇺🇸 //ˈθɜroʊ//
MeaningVery strong or focused.Complete and detailed in everything.
Examplean intensive language courseThe report was thorough and covered all relevant information.
RegisterNeutralFormal
How commonTop 2,000 (common)Beyond 10,000 (less common)
CEFR levelC1B2
Part of speechadjectiveadjective
Collocationsbe, highly, very, increasingly, be, highly, very, increasingly, be, highly, very, increasinglythorough analysis, thorough review, thorough understanding, thorough search, thorough assessment
Antonymseasy, simple, lightsuperficial, incomplete, partial
Common mistakesConfusing with 'extensive' which means covering a large area or amount., Using incorrectly to describe something simple or easy-going., Omitting the noun it describes, making the meaning unclear.Confused with 'through'; remember, 'thorough' means detailed., Used interchangeably with 'comprehensive', but they have slightly different implications., Omitted the second 'h' in spelling.
Usage notesUsed to describe courses, training, or efforts that require a lot of focus or effort. More commonly used in academic or formal contexts. Not suitable for casual conversations.Use 'thorough' in formal contexts. It's appropriate for academic writing, reports, or when expressing carefulness. Avoid in casual conversations.

Frequently asked questions: Intensive vs Thorough

What's the difference between Intensive and Thorough?

Intensive: Very strong or focused. Thorough: Complete and detailed in everything.

Which is more formal: Intensive and Thorough?

Thorough is the most formal of these.

Which is more common: Intensive and Thorough?

Intensive is the most common in everyday English.

Which is more advanced: Intensive and Thorough?

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

Are Intensive and Thorough the same CEFR level?

Intensive: C1, Thorough: B2 on the CEFR scale.

What part of speech are Intensive and Thorough?

Intensive: adjective, Thorough: adjective.

Can you show an example of each?

Intensive: an intensive language course Thorough: The report was thorough and covered all relevant information.

Can I use Intensive and Thorough interchangeably?

Not always. Intensive and Thorough 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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