adjective

having gained knowledge or skill in a particular field over time.

an experienced social worker

knowledgeable,skilful,skilled,expert,accomplished,adept,adroit,master,consummate,professional,proficient,trained,competent,capable,qualified,well trained,well versed,seasoned,with experience,practised,mature,veteran,long-serving,time-served,hardened,battle-scarred,crack,ace,mean,wizard