Definition from Wiktionary, the free dictionary
- (of a document) That can, or that must be certified.
- (informal, of a person) Mentally ill to such an extent that involuntary institutionalization is appropriate; crazy.
that can or must be certified
certifiable (plural certifiables)
- (informal) A crazy person.
2009 August 22, Bob Herbert, “Voices of Anxiety”, in New York Times:
- Forget the certifiables who are scrawling Hitler mustaches on pictures of the president.