Idiom: Not Playing With a Full Deck Posted on 25th June 201824th June 2018 by DoubleClick Not Playing With a Full Deck: Someone who lacks intelligence. Example: Don’t read this book any more because the writer is not playing with a full deck. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Posted in Idiom and tagged Idiom N.