| 1 | French | impromptu | improvised, not planned; improvised action;... |
| 2 | Latin | in promptu | ready, at hand |
| 3 | Latin | promptu | ablative singular of prōmptus; readiness |
| 4 | Latin | promptus | a taking forth; produced; manifest, disclosed |
| 5 | Latin | promo | I take or bring out or forth, produce, bring to... |
| 6 | Latin | pro- | forward direction, forward movement; action... |
| 7 | Latin | pro | + "ablative"; for; on behalf of, in the interest... |
| 8 | Proto-Indo-European | pro- | toward, forward |
| 9 | Proto-Indo-European | por- | to give birth; forward, through; going, passage |
| 10 | Proto-Indo-European | per- | before, in front; first; to go through |
| 11 | Proto-Indo-European | pr̥tós | passed , crossed |