| reserved(adjective, secret, sneaky, stealthy) |
| resourceful(adjective, smart, bright, intelligent) |
| smart(adjective, mean, smooth, keen, sharp) |
| subtle(mean, smooth, sharp, smart, clever) |
| tight-lipped(adjective, secret, sneaky, stealthy) |
| underhand(adjective, secret, sneaky, stealthy) |
| vigilant(adjective, sharp, bright, sensible, lively) |
| vulpine |
| watchful(adjective, sharp, smart, bright, sensible) |
| apprehensive(adjective, alert, careful, aware, attentive) |
| attentive(sharp, lively, restrained, careful, cautious) |
| conniving(mean, smooth, smart, dishonest, cunning) |
| deep(smooth, sharp, smart, bright, intelligent) |
| discerning(adjective, smooth, reasonable, keen, sharp) |
| feline(mysterious, private, reticent, taciturn, covert) |
| forethoughtful(careful, thoughtful, prudent, watchful, guarded) |
| gingerly(restrained, careful, reserved, cautious, prudent) |
| heady(adjective, smooth, keen, sharp, smart) |
| intelligent(adjective, smooth, keen, sharp, smart) |
| inventive(smart, bright, intelligent) |