| coinciding |
| collective(solid, consistent, joint, united, linked) |
| combined(solid, consistent, universal, joint, united) |
| commensurate |
| common(solid, consistent, universal, united) |
| communal(solid, consistent, universal, united) |
| complaisant(pleasant, friendly, agreeable, cordial, gracious) |
| compliant(adjective, keen, happy, agreeable, enthusiastic) |
| confederated(joint, linked, combined, homogeneous, cooperative) |
| conformable |
| conjoint(joint, linked, combined, homogeneous, cooperative) |
| conjugate(joint, linked, combined, homogeneous, cooperative) |
| conjunctive(joint, linked, combined, homogeneous, cooperative) |
| consensual(solid, consistent, universal, united) |
| consentaneous |
| consenting(adjective, keen, happy, agreeable, enthusiastic) |
| consolidated(joint, linked, combined, homogeneous, cooperative) |
| content(adjective, keen, happy, agreeable, enthusiastic) |
| conversable(pleasant, friendly, agreeable, cordial, gracious) |
| cool(adjective, friendly, agreeable, down, responsive) |