adj
certifiable
adj
1
Able to be officially confirmed or verified.
"The accountant provided certifiable proof of the company's earnings."
2
Informal: so irrational or extreme in behavior as to seem mentally ill; crazy.
"He's certifiable if he thinks that plan will work."
How to Use Certifiable
Learner’s notesIn plain EnglishAble to be officially proven, or (informally) so crazy it seems clinical.
When to use it
The "crazy" sense is informal and can be seen as flippant about mental illness — use carefully.
Word Forms
more certifiable comparative, certifiables plural, most certifiable superlative
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The accountant provided _____ proof of the company's earnings.
Etymology
Formed from certify + -able.