Adroit comes from droit, which is the Frence word for right(the opposite of left).Dexterous, which means pretty much the same thing as adroit. comes from dexter, which is the Latin word for right(the opposite of left). Right-handed people were once thought to be more dexterous and adroit than left handed people. In fact, left-handed people were once thought to be downright evil, or sinister, which is the Latin word for left(the opposite of right).

To say nowdays that right-handed people are better than left-handed people

would be considered gauche, which means grassless, crude, socially awkward,or clumsy. 

Gauche  is the Frence word for left(the opposite right). A synonym for gauche is maladroit.