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Longman Dictionary of Contemporary English
certifiable
adjective
EXAMPLES FROM OTHER ENTRIES
▪ "The Silence of the Lambs" was a certifiable hit.
▪ You'd have to be certifiable to do a bungee jump.
EXAMPLES FROM CORPUS
▪ As a singer, Mr Jackson is a certifiable megastar.
▪ Even a certifiable Moon rock that makes its own way to the Earth will be called a meteorite.
▪ He would undoubtedly consider her certifiable.
▪ It was from ridiculous to totally certifiable madness.
▪ Not normal, but not certifiable.
▪ Soon, the talk-show producer decides she has not found Mr Right but a certifiable wacko.
▪ There are times when you could send me away and they'd say I was certifiable.
The Collaborative International Dictionary
certifiable

certifiable \certifiable\ adj.

  1. presenting symptoms of mental illness sufficient for legal commitment to a mental institution.

    Syn: certified.

  2. capable of being guaranteed or certified: a certifiable fact.

Douglas Harper's Etymology Dictionary
certifiable

1846, from certify + -able. Meaning "so deranged as to be certifiably insane" is recorded from 1912.

Wiktionary
certifiable

a. 1 (context of a document English) That can, or that must be certified. 2 (context informal of a person English) mentally ill to such an extent that involuntary institutionalization is appropriate; crazy. n. (context informal English) A crazy person.

WordNet
certifiable
  1. adj. fit to be certified as insane (and treated accordingly) [syn: certified]

  2. capable of being guaranteed or certified; "a certifiable fact"

Usage examples of "certifiable".

The VidCommTech-4 had an unsettling enthusiasm for cloud-filled skies, but as far as anyone knew it was not an arrestable offence although it might be a certifiable disorder.

And even among these hardcore certifiables there are certain people who command awed respect for the truly legendary extent of their brain damage.