don’t judge a book by its cover
Meaning
Don’t form an opinion about someone or something based only on appearance; the reality may be different.
Origin
From the idea that a book’s cover doesn’t reveal the quality or content inside. The wording is widely attested in 20th-century English and popularized through sayings, media, and titles.
Notes
Common advice/warning. Used about people, products, or situations where appearances can be misleading; gentle but can be mildly admonishing.
Examples
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He looked intimidating, but don’t judge a book by its cover—he’s actually very kind.
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The restaurant seems small from the outside, but don’t judge a book by its cover; the food is amazing.
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I almost skipped that resume because of the messy formatting, but I reminded myself: don’t judge a book by its cover.
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That old laptop may not look like much, but don’t judge a book by its cover—it still runs perfectly.
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She’s quiet in meetings, yet don’t judge a book by its cover; she has the strongest ideas on the team.
Grammar & Usage Notes
Usually appears in the negative imperative: “Don’t judge a book by its cover.” Variants include “You can’t judge a book by its cover” and “Never judge a book by its cover.” “Cover” is typically singular with “its.”
Synonyms
- appearances can be deceiving
- don’t go by appearances
- don’t judge by appearances
Antonyms
- take something at face value