Know how to use "fewer" and "less"? Find out.
certifiable cer·ti·fi·a·ble (sûr'tə-fī'ə-bəl)
That can or must be certified. Used of infectious, industrial, and other diseases that are required by law to be reported to health authorities.
Relating to or being a person showing disordered behavior of sufficient gravity to justify involuntary mental hospitalization.
So deranged as to be officially certified insane: her comments suggest she's certifiable (1939+)