not know from nothing
To be completely ignorant or uninformed (about something). Don't ever second-guess my judgment again, you hear me? You don't know from nothing! Don't mind her, Phil. She doesn't know from nothing.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
not know from nothing
Inf. to be stupid, innocent, and naive. (This nothing is not replaced with something. Usually used with don't, as in the examples.) Old John—he don't know from nothing. What do you expect from somebody who don't know from nothing?
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
know (or not know) from nothing
be totally ignorant, either generally or concerning something in particular. North American informalFarlex Partner Idioms Dictionary © Farlex 2017
not know from nothing
in. to be stupid, innocent, and naive. (see also
know from something.)
Tom don’t know from nothing. He is really dense. McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.