1) Calculating 2) Calculative 3) Collusive 4) Covert 5) Deceitful 6) Devious 7) Foxy 8) Scheming 9) Sly 10) Up to no good 1) Collusive 2) Covert 3) Machiavellian 4) Sneakily shrewd 5) To scheme and plot 6) Used of persons 
• (p. pr. & vb. n.) of Connive
connive, conniving 1. To cooperate secretly in an illegal or wrongful action; to collude; to conspire: 'The dealers connived with customs officials to bring narcotics across the border.' 2. To avoid noticing something wrong; to give aid to wrongdoing by not telling about it or by secretly helping it. 3. To feign ignorance of or fail to take measu...