Same word as veter:

accomplished, accustomed, adept, been around, been there, broken in, capable, competent, cultivated, dynamite, expert, familiar, having something on the ball, in the know, instructed, knowing one's stuff, knowing the score, mature, matured, old, old hand, practical, practiced, pro, professional, qualified, rounded, seasoned, skillful, sophisticated, sport, tested, the right stuff, trained, tried, versed, vet, veteran, well-versed, wise, worldly, worldly-wise