Whatever __ knew or didn't know vs Whatsoever

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

Whatever __ knew or didn't know

High-frequency chunk

Whatsoever

Top 3,000 (common)C1adverb
Most common: Whatever __ knew or didn't know
 Whatever __ knew or didn't knowWhatsoever
Pronunciation🇬🇧 //wɒˈtɛv.ə//🇺🇸 //wɑˈtɛv.ər//🇬🇧 /["/ˌwɒtsəʊˈevə(r)/"]/🇺🇸 /["/ˌwʌtsəʊˈevər/"]/
MeaningAnything that someone knew or didn't know.At all; in any way.
ExampleWhatever he knew or didn't know was crucial to the investigation.They received no help whatsoever.
RegisterNeutralNeutral
How commonHigh-frequency chunkTop 3,000 (common)
CEFR level-C1
Part of speechadverb
Collocationswhatever happens, whatever you need, whatever it takesnot do anything whatsoever, have no interest whatsoever, leave me alone whatsoever
Antonyms-certainly, definitely
Common mistakesOmitting 'whatever' can change the meaning., Confusing 'whatever' with 'whichever' in this context., Misplacing the verb structure after 'whatever'.Used it in affirmative sentences instead of negatives., Confused with 'whatever'., Omitted 'not' in sentences where it's necessary.
Usage notesUsed to refer to all possible knowledge or ignorance of a subject. Common in both speaking and writing, often in informal discussions.Used for emphasis, especially in negative contexts. It's common in both spoken and written English, but can sound a bit formal in casual conversations.

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Whatever __ knew or didn't know

Frequently asked questions: Whatever __ knew or didn't know vs Whatsoever

What's the difference between Whatever __ knew or didn't know and Whatsoever?

Whatever __ knew or didn't know: Anything that someone knew or didn't know. Whatsoever: At all; in any way.

Which is more common: Whatever __ knew or didn't know and Whatsoever?

Whatever __ knew or didn't know is the most common in everyday English.

Can you show an example of each?

Whatever __ knew or didn't know: Whatever he knew or didn't know was crucial to the investigation. Whatsoever: They received no help whatsoever.

Can I use Whatever __ knew or didn't know and Whatsoever interchangeably?

Not always. Whatever __ knew or didn't know and Whatsoever 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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