The Unadi-Sutras (Sanskrit ) are a group of texts in Indian grammatical tradition (VyÃÂkaraá¹Âa). They form an accessory to the Aá¹£á¹ÂÃÂdhyÃÂyë ("Eight Chapters", the grammar of PÃÂá¹Âini). They deal with Sanskrit affixes. They propose to validate the view attributed to à ÂÃÂkaá¹ÂÃÂyana that all words can be analysed by the addition of affixes to verbal roots. As a consequence, the notion of "affix" for the purposes of the Unadi-Sutras is extremely loose and not necessarily etymological; the classical grammarians (such as Patañjali) were aware that this means of derivation was purely formal and in many cases had no relation to the word's actual meaning.
The authorship and date of the oldest Unadi-Sutras (known as the Panchapadi-Unadi-Sutras) is uncertain; some authors would attribute them to PÃÂá¹Âini himself, others to his predecessors, such as à ÂÃÂkaá¹ÂÃÂyana, ÃÂpià Âali, or KÃÂtyÃÂyana. The name uá¹ÂÃÂdi is derived from the incipit, as the text begins with the treatment of the affix -uá¹Â-. The texts survive only with substantial variation. In addition, the later grammatical schools have added numerous additional Unadi-Sutras, each particular to the respective school.
Numerous commentaries on the Unadi-Sutras proper are extant, including the Uá¹ÂÃÂdisà «travá¹Âtti of Ujjvaladatta (13th century?), the Uá¹ÂÃÂdivá¹Âtti of Svetavanavasin, the Prakriyasarvasva of Narayanabhatta (17th century), the Siddhanta Kaumudi and Pradhha Manorama of Bhaá¹Âá¹Âoji Dëká¹£ita (17th century), the Unadikosa of Mahadevavedantin (17th century), the Aunadikapadarnava of Perusuri (early 19th century), the Unadi-kosa of Dayananda Sarasvati (mid 19th century), the Dasapadyunadivrtti and Prasada of Manikyadeva.