From Middle Welsh gwadu, from Proto-Brythonic *gwodad, from Proto-Celtic *wotāti, from Proto-Indo-European *woth₂-éye-ti from Proto-Indo-European *weth₂- (“to say”).
gwadu (first-person singular present gwadaf)
| singular | plural | impersonal | ||||||
|---|---|---|---|---|---|---|---|---|
| first | second | third | first | second | third | |||
| present indicative/future | gwadaf | gwedi | gwad | gwadwn | gwedwch, gwadwch | gwadant | gwedir | |
| imperfect (indicative/subjunctive)/ conditional |
gwadwn | gwadit | gwadai | gwadem | gwadech | gwadent | gwedid | |
| preterite | gwedais | gwedaist | gwadodd | gwadasom | gwadasoch | gwadasant | gwadwyd | |
| pluperfect | gwadaswn | gwadasit | gwadasai | gwadasem | gwadasech | gwadasent | gwadasid, gwadesid | |
| present subjunctive | gwadwyf | gwedych | gwado | gwadom | gwadoch | gwadont | gwader | |
| imperative | — | gwada | gwaded | gwadwn | gwedwch, gwadwch | gwadent | gwader | |
| verbal noun | gwadu | |||||||
| verbal adjectives | gwadedig gwadadwy | |||||||
| Inflected colloquial forms | singular | plural | ||||
|---|---|---|---|---|---|---|
| first | second | third | first | second | third | |
| future | gwada i, gwadaf i | gwadi di | gwadith o/e/hi, gwadiff e/hi | gwadwn ni | gwadwch chi | gwadan nhw |
| conditional | gwadwn i, gwadswn i | gwadet ti, gwadset ti | gwadai fo/fe/hi, gwadsai fo/fe/hi | gwaden ni, gwadsen ni | gwadech chi, gwadsech chi | gwaden nhw, gwadsen nhw |
| preterite | gwadais i, gwades i | gwadaist ti, gwadest ti | gwadodd o/e/hi | gwadon ni | gwadoch chi | gwadon nhw |
| imperative | — | gwada | — | — | gwadwch | — |
| Note: All other forms are periphrastic, as usual in colloquial Welsh. | ||||||
| Welsh mutation | |||
|---|---|---|---|
| radical | soft | nasal | aspirate |
| gwadu | wadu | ngwadu | unchanged |
| Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs. | |||