From diddan (“amusing, pleasant”). See also Old Irish do·dona for a parallel formation from the same root.
diddanu
| singular | plural | impersonal | ||||||
|---|---|---|---|---|---|---|---|---|
| first | second | third | first | second | third | |||
| present indicative/future | diddanaf | diddeni | diddana | diddanwn | diddenwch, diddanwch | diddanant | diddenir | |
| imperfect (indicative/subjunctive)/ conditional |
diddanwn | diddanit | diddanai | diddanem | diddanech | diddanent | diddenid | |
| preterite | diddenais | diddenaist | diddanodd | diddanasom | diddanasoch | diddanasant | diddanwyd | |
| pluperfect | diddanaswn | diddanasit | diddanasai | diddanasem | diddanasech | diddanasent | diddanasid, diddanesid | |
| present subjunctive | diddanwyf | diddenych | diddano | diddanom | diddanoch | diddanont | diddaner | |
| imperative | — | diddana | diddaned | diddanwn | diddenwch, diddanwch | diddanent | diddaner | |
| verbal noun | diddanu | |||||||
| verbal adjectives | diddanedig diddanadwy | |||||||
| Inflected colloquial forms | singular | plural | ||||
|---|---|---|---|---|---|---|
| first | second | third | first | second | third | |
| future | diddana i, diddanaf i | diddani di | diddanith o/e/hi, diddaniff e/hi | diddanwn ni | diddanwch chi | diddanan nhw |
| conditional | diddanwn i, diddanswn i | diddanet ti, diddanset ti | diddanai fo/fe/hi, diddansai fo/fe/hi | diddanen ni, diddansen ni | diddanech chi, diddansech chi | diddanen nhw, diddansen nhw |
| preterite | diddanais i, diddanes i | diddanaist ti, diddanest ti | diddanodd o/e/hi | diddanon ni | diddanoch chi | diddanon nhw |
| imperative | — | diddana | — | — | diddanwch | — |
| Note: All other forms are periphrastic, as usual in colloquial Welsh. | ||||||