| close-mouthed(adjective, quiet, restrained, mysterious, reticent) |
| cognizant(careful, aware, attentive, wary, watchful) |
| collusive(adjective, dishonest, deceitful, dubious, shrewd) |
| conscientious(adjective, careful, cautious, aware, attentive) |
| conscious(careful, cautious, aware, attentive, wary) |
| conservative(cautious, tactful, circumspect) |
| considerate(careful, thoughtful, cautious, prudent, suspicious) |
| contriving(dishonest, dubious, suspicious, subtle, tactful) |
| controlled(cautious, tactful, circumspect) |
| conversant(careful, aware, attentive, wary, watchful) |
| covert(mean, smooth, smart, cunning, reticent) |
| crooked(adjective, mean, smooth, dishonest, cunning) |
| cryptic(mysterious, private, reticent, taciturn, covert) |
| cutting(sharp, smart, intelligent, clever, astute) |
| deceptive(adjective, mean, smooth, cunning, deceitful) |
| deep-laid |
| dexterous(smart, shrewd, clever, subtle, tactful) |
| discriminating(smooth, sharp, smart, intelligent, wise) |
| dissembling(adjective, mean, smooth, cunning, knowing) |
| double-dealing(adjective, mean, smooth, cunning, knowing) |