Dexterous comes from the Latin word dexter, meaning "on the right side." Since most people are right-handed, and therefore do things more easily with their right hand, dexter developed the sense of skillful.

Is dexterous a real word?

skillful or adroit in the use of the hands or body. having mental adroitness or skill; clever.

What is the meaning of not being dexterous?

not being dexterous means, meaning. uncomfortable, clumsy, unclear, clueless.