"shrewd" in the adjective sense
1. astute, sharp, shrewd
marked by practical hardheaded intelligence
"a smart businessman"
"an astute tenant always reads the small print in a lease"
"he was too shrewd to go along with them on a road that could lead only to their overthrow"
2. calculating, calculative, conniving, scheming, shrewd
acting with a specific goal
"the most calculating and selfish men in the community"
Source: WordNet® (An amazing lexical database of English)
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