According to Bulgarian Etymological Dictionary, inherited from Proto-Slavic *merzgavъ, akin to 0-grade verb мръ́ждя (mrǎ́ždja, “to glimmer”). Has been also compared with Proto-Slavic *brězgъ (“downbreak”), on the assumption of irregular alternation *br- ↔ *mr-.
Gerov spells the lemma with nasal -ѧ-, perhaps in analogy with (rhyming) near-synonym дре́згав (drézgav, “impermeable, dim, shadowy”) < *dręzga (“thicket”).
мре́згав • (mrézgav) (dialectal)
| masculine | feminine | neuter | plural | |
|---|---|---|---|---|
| indefinite | мре́згав mrézgav |
мре́згава mrézgava |
мре́згаво mrézgavo |
мре́згави mrézgavi |
| definite (subject form) |
мре́згавият mrézgavijat |
мре́згавата mrézgavata |
мре́згавото mrézgavoto |
мре́згавите mrézgavite |
| definite (object form) |
мре́згавия mrézgavija |
| masculine | feminine | neuter | plural | |
|---|---|---|---|---|
| indefinite | по́-мре́згав pó-mrézgav |
по́-мре́згава pó-mrézgava |
по́-мре́згаво pó-mrézgavo |
по́-мре́згави pó-mrézgavi |
| definite (subject form) |
по́-мре́згавият pó-mrézgavijat |
по́-мре́згавата pó-mrézgavata |
по́-мре́згавото pó-mrézgavoto |
по́-мре́згавите pó-mrézgavite |
| definite (object form) |
по́-мре́згавия pó-mrézgavija |
| masculine | feminine | neuter | plural | |
|---|---|---|---|---|
| indefinite | на́й-мре́згав náj-mrézgav |
на́й-мре́згава náj-mrézgava |
на́й-мре́згаво náj-mrézgavo |
на́й-мре́згави náj-mrézgavi |
| definite (subject form) |
на́й-мре́згавият náj-mrézgavijat |
на́й-мре́згавата náj-mrézgavata |
на́й-мре́згавото náj-mrézgavoto |
на́й-мре́згавите náj-mrézgavite |
| definite (object form) |
на́й-мре́згавия náj-mrézgavija |