skilled in the art of negotiation
skilled
/ˈskild/
adjective
having acquired mastery of or skill in something (such as a technique or a trade)
of, relating to, or requiring workers or labor with skill and training in a particular occupation, craft, or trade
proficient adept skilled skillful expert mean having great knowledge and experience in a trade or profession. proficient implies a thorough competence derived from training and practice. adept implies special aptitude as well as proficiency.
verb
verb
to reduce the level of skill needed for (a job)
to reduce the level of skill needed for a job by (a worker)