mad as a hatter

Etymology
First recorded 1829. Of uncertain origin, though usually explained as referring to hat-makers suffering from due to handling mercury-contaminated felt. Derivation from or its descendant 🇨🇬 lacks evidence.

Adjective

 * 1) Crazy or demented.

Synonyms

 * disturbed, insane, loopy, nutty
 * mad as a March hare
 * See also Thesaurus:insane

Translations

 * Dutch:
 * Finnish:
 * Hungarian: sült bolond, teljesen bolond
 * Icelandic: bandvitlaus
 * Italian: fuori di testa, fuori come un balcone, matto da legare
 * Russian:, не в своём уме́, вы́живший из ума́
 * Spanish: más loco que una cabra, como una chota