Thread:User talk:CodeCat/Appendix:Proto-Slavic/boljьjь/reply

I'm not sure whether the adverbs really belong on the entry for the adjective. Proto-Slavic probably had an adverbial form, which the Russian one then descended from instead. But I haven't gotten around to learning about the adverbs yet. I am curious how Russian ended up with two different adverbs, too.