| dubious |
| incredulous(adjective, skeptical, mistrustful, distrustful, unbelieving) |
| meticulous(adjective, deliberate, alert, careful, thoughtful) |
| protective(adjective, thoughtful, sober, cautious, prudent) |
| sagacious(adjective, sensible, wise, cautious, clever) |
| saving(adjective, careful, cautious, prudent, suspicious) |
| sceptical |
| skillful(adjective, smart, sensible, cunning, wise) |
| sleepless(keen, alert, careful, restless, disturbed) |
| solicitous(adjective, kind, deliberate, alert, careful) |
| suspecting(mistrustful, distrustful) |
| thrifty(adjective, sensible, careful, wise, cautious) |
| acute(smooth, keen, careful, clever, subtle) |
| all ears(expression, sharp, bright, lively, alert) |
| devious(adjective, smooth, sharp, cunning, shrewd) |
| dexterous(smart, shrewd, clever, subtle, artful) |
| eagle-eyed |
| enlightened(reasonable, sensible, careful, intelligent, wise) |
| erudite(sensible, intelligent, sage) |
| feline(adjective, cunning) |