| cautious(keen, alert, careful, attentive, watchful) |
| certain |
| chafing(adjective, keen, violent, anxious, eager) |
| choleric(adjective, keen, violent, anxious, eager) |
| circumspect(keen, alert, careful, attentive, watchful) |
| concentrated |
| concerned(adjective, keen, warm, passionate, excited) |
| confounded |
| conscious |
| consumed with curiosity(expression, idiom) |
| cottonmouthed(adjective, keen, anxious, dry, eager) |
| covetous(adjective, keen, enthusiastic, excited, ready) |
| crazy about(expression, adjective, keen, warm, passionate) |
| crazy for(expression, adjective, keen, anxious, dry) |
| curt(adjective, keen, violent, anxious, eager) |
| dehydrated(adjective, keen, anxious, dry, eager) |
| demanding(adjective, keen, violent, anxious, eager) |
| desiring(adjective, keen, wild, enthusiastic, excited) |
| devoted(adjective, strong, keen, warm, intense) |
| diligent |