Definition of certifiably adverb from the Oxford Advanced Learner's Dictionary

 

certifiably

 adverb
adverb
BrE BrE//ˈsɜːtɪfaɪəbli//
 
; NAmE NAmE//ˈsɜːrtɪfaɪəbli//
 
 
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a person who is certifiably insane (1) can or should be officially stated to be insane (1)