cer ‧ ti ‧ fi ‧ ab ‧ le /ˈsɜːtəfaɪəb ə l, ˈsɜːtɪfaɪəb ə l $ ˌsɜːrtəˈfaɪ-/ BrE AmE adjective
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