Longman Dictionary of Contemporary English homepage

certifiable

 adjective
     
cer‧ti‧fi‧ab‧le
1 informal crazy, especially in a way that is dangerous:
If you ask me, that man is certifiable.
2 especially American English definitely a particular thing:
The guy's a certifiable megastar.
3 especially American English good enough to be officially approved:
grade A certifiable beef
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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