you can't judge a book by its cover
- 1Outward appearances are an unreliable guide to the true character or worth of a person or thing.
Like a plain, dull envelope that turns out to hold an important letter inside.
The candidate's rumpled suit fooled everyone, but his interview was brilliant: you can't judge a book by its cover.
Investors dismissed the modest startup until its profits soared, proving you can't judge a book by its cover.
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