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1. certifiable
British slang for "insane". Derived from "certifiably insane".
The evil genius villains in James Bond movies appear to be highly intelligent when, in actuality, they are certifiable.
2. Certifiable
(adj) Completely NUTS. Past the point of "ticking". Ready to flip OUT.
Oh shit! That chick's been off her meds for a few days now! She's certifiable!
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