| alert(adjective, bright, lively, careful, cautious) |
| calculating(adjective, mean, smooth, keen, sharp) |
| deceitful(adjective, mean, smooth, cunning, dubious) |
| devious(adjective, smooth, sharp, deceitful, untrustworthy) |
| elusive(adjective, mean, smooth, cunning, dubious) |
| guileful(adjective, mean, smooth, sharp, cunning) |
| heedful(adjective, sharp, lively, careful, cautious) |
| opportunistic(subtle, tactful, suave) |
| perspicacious(adjective, sharp, ability, smart, careful) |
| acute(adjective, smooth, keen, sharp, smart) |
| apt(adjective, smooth, smart, bright, intelligent) |
| arch(mean, smooth, smart, cunning, clever) |
| buttoned up(adjective, secret, sneaky, stealthy) |
| close(adjective, secret, sneaky, stealthy) |
| dishonest(adjective, secret, sneaky, stealthy) |
| disingenuous(adjective, shrewd) |
| furtive(adjective, secret, sneaky, stealthy) |
| mistrustful(adjective, cautious, suspicious, wary, watchful) |
| observant(adjective, sharp, bright, lively, careful) |
| politic(adjective, careful, thoughtful, cautious, prudent) |