Reconstruction:Proto-Slavic/-ьjь

Etymology 1
Extending ending of archaic i-stem adjectives, effectively equivalent to. In Late Common Slavic, the accent was retracted from the ending on the preceding syllable (known as Ivšić's law). A similar effect occurred already during Balto-Slavic when an acute syllable attracted the accent from the ending, e.g. in 🇨🇬 from 🇨🇬 (compare 🇨🇬).

Old Church Slavonic preserved a few true i-stem adjectives, however, they were indeclinable for gender, case or number : e.g. 🇨🇬,, , ,. In parallel to these forms, there were declinable derivatives of theirs with o-stem declension:, , , ,.

All other i-stem adjectives were extended with secondary suffixes such as, , or by historical times. Nonetheless, in Old Church Slavonic, the comparative and superlative form of these adjectives was still formed from the earlier i-stem, e.g. :  (instead of the later ). For comparison, consider the o-stem :.

Cognate with Latin third declension 🇨🇬, Germanic i-stem declension 🇨🇬, and Greek third ι-stem declension.

Suffix

 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←
 * (later replaced by ) ←

Descendants

 * East Slavic:
 * South Slavic:
 * West Slavic:
 * Sorbian:
 * South Slavic:
 * West Slavic:
 * Sorbian:
 * West Slavic:
 * Sorbian:
 * West Slavic:
 * Sorbian:
 * West Slavic:
 * Sorbian:
 * West Slavic:
 * Sorbian:
 * Sorbian:
 * Sorbian:
 * Sorbian:

Etymology 2
From o-stems or i-stems. Cognate with 🇨🇬, 🇨🇬.

Descendants

 * East Slavic:
 * South Slavic:
 * Serbo-Croatian:
 * West Slavic:
 * Sorbian:
 * Serbo-Croatian:
 * West Slavic:
 * Sorbian:
 * Serbo-Croatian:
 * West Slavic:
 * Sorbian:
 * West Slavic:
 * Sorbian:
 * Sorbian:
 * Sorbian:
 * Sorbian:

Etymology 3
From.

Descendants

 * East Slavic:
 * South Slavic:
 * West Slavic:
 * Sorbian:
 * South Slavic:
 * West Slavic:
 * Sorbian:
 * West Slavic:
 * Sorbian:
 * West Slavic:
 * Sorbian:
 * West Slavic:
 * Sorbian:
 * Sorbian:
 * Sorbian:
 * Sorbian:
 * Sorbian:
 * Sorbian: