shrewd
adjective
uk/ʃruːd/ usable to judge people and situations well and make good decisions:
My one big regret is about money - I wish I'd been more shrewd.
Simon is an extremely shrewd businessman.
The time is ripe for shrewd investors to make a killing on investment trusts.
based on good understanding or judgment:
The banks have probably taken a shrewd decision selling some stock now.
Shrewd investment in American property soon reaped Gilbert a second fortune.
Looking to the East to invest might be a shrewd move.
shrewdly
adverb
He shrewdly invested his earnings.