experienced
experient
skilled
accomplished
at concert pitch
blase
career
coached
conversant
cosmopolitan
cosmopolite
experience
expert
finished
initiate
initiated
knowing
mature
matured
not born yesterday
old
old-time
practical
prepared
primed
professional
ripe
ripened
sagacious
seasoned
sophisticated
technical
trained
tried
tried and true
versed
vet
veteran
world-wise
worldly
worldly-wise
practised