a device designed to provide additional strength; "the cardboard backing was just a strengthener"; "he used gummed reinforcements to hold the page in his notebook"
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"
concealing crafty designs for advancing your own interest; "a selfish and designing nation obsessed with the dark schemes of European intrigue"- W.Churchill; "a scheming wife"; "a scheming gold digger"