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to not play with a full deck
01
理不尽な人
to lack intelligence or rationality
![to {not} [play] with a full deck definition and meaning](https://cdn.langeek.co/photo/42148/original/?type=jpeg "to {not} [play] with a full deck definition and meaning")
What is the origin of the idiom "not play with a full deck" and when to use it?
The idiom "not play with a full deck" likely originates from the world of card games, where a complete deck is necessary for fair and functional play. In this context, someone "not playing with a full deck" suggests a lack of mental completeness or sharpness, akin to a deck of cards missing some cards. The expression is used figuratively to describe individuals perceived as mentally challenged, irrational, or lacking common sense.
例
After his strange explanation for the missing files, it's clear he's not playing with a full deck.
She insists that her bizarre theories are true, but everyone thinks she's not playing with a full deck.
