nothing if not

nothing if not idiom
Above all else, as in He was nothing if not discreet. Shakespeare used this idiom in Othello (2:1): “I am nothing if not critical.” [c. 1600]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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