| 1 | English | ineffective | not having the desired effect; ineffectual;... |
| 2 | English | effective | Having the power to produce a required effect or... |
| 3 | English | effect | The result or outcome of a cause; Impression left... |
| 4 | Middle English | effect | — |
| 5 | Old French | effect | effect; judgment; decree |
| 6 | Latin | effectus | made out, worked out, completed, finished,... |
| 7 | Latin | efficiō | — |
| 8 | Latin | ex | A name of the letter "X"; out of, from |
| 9 | Latin | commūnicō | — |
| 10 | Latin | commūnis | — |
| 11 | Old Latin | com(m)oinis | — |
| 12 | Proto-Italic | kommoinis | — |
| 13 | Proto-Indo-European | ḱom-moy-ni- | held in common |
| 14 | Proto-Indo-European | ḱóm | beside, near, by, with |
| 15 | Proto-Indo-European | ḱe | Deictic particle, here; Post-positional... |
| 16 | Middle English | kyt | — |
| 17 | Russian | кит | whale; genitive plural of ки́та |
| 18 | Old Church Slavonic | китъ | whale |
| 19 | Ancient Greek | κῆτος | whale, sea monster; abyss |