judge a book by its cover, one can't
One can't rely on outward appearances to know what something or someone is really like. For example, He seems very quiet, but you can't judge a book by its cover. [First half of 1900s]
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Words nearby judge a book by its cover, one can't
judeo-christian, judeo-spanish, judezmo, judg., judge, judge a book by its cover, one can't, judge advocate, judge advocate general, judge lynch, judge not, that ye be not judged, judge-made
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.