A mentally challenged person who is very gifted in one area of activity, e.g. the piano. This condition is associated with autism.(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "idiot-savant" in a sentence
"The focus on mathematical training in these programs is so intense that they tend to produce a sort of idiot-savant, competent only to publish in academic journals."
"I think that the idiot-savant problem is real, and Joseph Stiglitz is an example of someone whose economic reasoning and policy analysis strike me as disjoint."
"The corporation in this global market has morphed into a kind of idiot-savant."