noun
person ignorant outside their specialty; overspecialized person; one-trick pony
Derogatory term for someone deeply knowledgeable in one narrow area but clueless about everything else. Often used critically or self-deprecatingly.
彼は数学の専門バカで、簡単な家事もできない。
He's a math specialist who is ignorant of everything else; he can't even do simple housework.
専門
I want to acquire broad knowledge so I don't become a one-trick pony.