conj

whereof

weh-uhr-OV

conj

Of which, or of whom.

"He spoke of matters whereof he had little real knowledge."

How to Use Whereof

Learner’s notes

In plain EnglishA formal, old-fashioned way of saying "of which" or "of whom."

When to use it

Rare, formal, and literary — most familiar from the phrase "whereof one cannot speak."

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Can you complete this real example?

He spoke of matters _____ he had little real knowledge.

From Middle English wherof, formed from "where" plus "of."

thereof