| 1 | English | confidential | Kept, or meant to be kept, secret within a... |
| 2 | French | confidentiel | confidential |
| 3 | French | confident | confidant |
| 4 | Italian | confidente | confiding, trusting; confidant or confidante |
| 5 | Latin | cōnfīdēns | — |
| 6 | Latin | cōnfīdō | — |
| 7 | Latin | cōn- | — |
| 8 | Latin | cum | with, along with; at; -fold |
| 9 | Old Latin | com | Alternative form of cum |
| 10 | Proto-Italic | kom | with, along, at |
| 11 | Proto-Indo-European | ḱóm | beside, near, by, with |
| 12 | Proto-Indo-European | ḱe | Deictic particle, here; Post-positional... |
| 13 | Middle English | kyt | — |
| 14 | German | kitt | — |
| 15 | Old High German | kuti | — |
| 16 | Proto-West Germanic | kwidu | gum, resin |
| 17 | Proto-Germanic | kweduz | resin |
| 18 | Proto-Indo-European | gʷet- | resin, gum; to say, speak |
| 19 | Proto-Indo-European | gū- | to bend; curve; arch; vault; to bow, bend, arch,... |