know-nothing(redirected from a know nothing)
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A completely ignorant, uninformed, or unknowledgeable person. I wish my father had never hired a know-nothing like you to manage our accounts!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
- know from nothing
- not know from nothing
- what (someone) doesn't know can't hurt them
- what (someone) doesn't know won't hurt them
- what one doesn't know won't hurt one
- What you don't know won't hurt you
- stay in the dark
- stay in the dark about (something)
- what the eye doesn't see
- what the eye doesn't see, the heart doesn't grieve over