Clandestine (adj.)- Secret, surreptitious, stealthy, conducted with or marked by hidden claims or methods.

 

Abject - miserable, wretched, Of the most contemptible kind, Showing humiliation or submissiveness, Showing utter resignation or hopelessness

 

Adroit (adj.)- Skillful (or showing skill) in adapting means to ends , Quick or skillful or adept in action or thought

 

Maven (n) - Adept, one who is highly skilled

 

Dexterity - Adroitness in using the hands, mental adroitness, agility

 

Nimbleness - The gracefulness of a person or animal that is quick and nimble(agile, graceful,  sharp, keen, perceptive)