English

Adjective

one card shy of a full deck

1. (idiomatic) mentally deranged; demented; insane.

   That guy might be one card shy of a full deck — he thinks that substitute sugar is really a government tracking system.

Synonyms

• a few sandwiches short of a picnic
• See also Wikisaurus:insane.

Antonyms

• play with a full deck
• See also Wikisaurus:sane.

Related terms

• full-deckism

References

• Dictionary.com – crazy