fachidiot

Etymology
Borrowed from.

Noun

 * 1)  A (narrow) specialist expert who is ignorant outside of their specialty, or who only looks at problems through the (blinkered) lens of their own specialty.

Translations

 * Czech:
 * Danish: fagidiot
 * Dutch:
 * Finnish:
 * German:
 * Hungarian:
 * Japanese: 専門バカ
 * Norwegian: fagidiot
 * Swedish: