1) Certifiable 2) Certificated 3) Credentialed 4) Documented 5) Fit to be certified as insane 6) Guaranteed 7) Legally declared insane 8) Like some important letters Found on https://www.crosswordclues.com/clue/certified
[adj] - having quality or payment or delivery guaranteed 2. [adj] - holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill 3. [adj] - endorsed authoritatively as having met certain requirements Found on http://www.webdictionary.co.uk/definition.php?query=certified
qualifiedadjective holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill; `a registered pharmacist`; `a registered hospital` Found on https://www.encyclo.co.uk/local/20974
having or proved by a certificate: a certified representative. · guaranteed; reliably endorsed: a certified check. · legally declared insane. · committed to a mental institution. Found on https://www.infoplease.com/dictionary/certified