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certifiable (adj.)

1846, "capable of being declared as true," from certify + -able. Meaning "so deranged as to be certifiably insane" is recorded from 1870, from certify in the specific sense "officially declare (someone) to be insane" (1822). The certification was done by local officials, later medical officers, and often included a statement as to whether the person was harmless or dangerous, curable or incurable.

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Definitions of certifiable

certifiable (adj.)
fit to be certified as insane (and treated accordingly);
Synonyms: certified
certifiable (adj.)
capable of being guaranteed or certified;
a certifiable fact
From wordnet.princeton.edu