From Proto-Celtic *reteti, from Proto-Indo-European *Hreth₂-.
reithid (conjunct ·reith, verbal noun riuth or rith)
| 1st sg. | 2nd sg. | 3rd sg. | 1st pl. | 2nd pl. | 3rd pl. | Passive sg. | Passive pl. | ||
|---|---|---|---|---|---|---|---|---|---|
| Present indicative | Abs. | rithu, rithim | rithi | rethid, rethith | rethmai | reithe | rethait | ||
| Conj. | ·riuth | ·rethi | ·reith | ·retham | ·reithid | ·rethat | |||
| Rel. | rethes, rethess | retae, rethae | |||||||
| Imperfect indicative | ·reitis, ·reithis | ||||||||
| Preterite | Abs. | ráith | ráthatar | ||||||
| Conj. | |||||||||
| Rel. | |||||||||
| Perfect | Deut. | ro·ráthatar | |||||||
| Prot. | ·rorthatar, ·rorthetar, ·rrúairthetar | ||||||||
| Future | Abs. | reiss | |||||||
| Conj. | ·ré | ·ressat | |||||||
| Rel. | |||||||||
| Conditional | |||||||||
| Present subjunctive | Abs. | reiss | |||||||
| Conj. | ·ré | ·ressat | |||||||
| Rel. | |||||||||
| Past subjunctive | ·ressed | ||||||||
| Imperative | |||||||||
| Verbal noun | rith, riuth | ||||||||
| Past participle | |||||||||
| Verbal of necessity | |||||||||
| radical | lenition | nasalization |
|---|---|---|
| reithid also rreithid after a proclitic ending in a vowel |
reithid pronounced with /r(ʲ)-/ |
unchanged |
Note: Certain mutated forms of some words can never occur in Old Irish.
All possible mutated forms are displayed for convenience.