Princeton's WordNet

1. mutter, muttering, murmur, murmuring, murmuration, mussitation(noun)

   a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech

2. grumble, grumbling, murmur, murmuring, mutter, muttering(adj)

   a complaint uttered in a low and indistinct tone

3. murmuring, susurrant, whispering(adj)

   making a low continuous indistinct sound

   "like murmuring waves"; "susurrant voices"

Webster Dictionary

1. Murmuring(u)

   of Murmur

2. Murmuring(u)

   uttering murmurs; making low sounds; complaining

• murmererendAfrikaans
• تَمْتَمَه،غَمْغَمَه، هَمْهَمَهArabic
• мърморещBulgarian
• murmurantePortuguese (BR)
• zurčící, šumícíCzech
• murmelndGerman
• mumlendeDanish
• που μουρμουρίζειGreek
• murmuranteSpanish
• kahisevEstonian
• زمزمهFarsi
• mumisevaFinnish
• murmurantFrench
• מְמַלמֵלHebrew
• फुसफुसाहट, गुनगुनाहटHindi
• mrmljav, gunđavCroatian
• morgóHungarian
• gumamIndonesian
• muldrandi; suðandiIcelandic
• mormoranteItalian
• つぶやくJapanese
• 살랑거림Korean
• murmantis,šlamantisLithuanian
• burbuļojošs; čalojošs; murminošsLatvian
• mengigauMalay
• murmelendDutch
• mumlende, rislendeNorwegian
• szemrzącyPolish
• زمزمهPersian
• زمزمهPashto
• murmurantePortuguese
• murmurător, care mur­­murăRomanian
• журчащий; приглушённыйRussian
• zurčiaci; šumiaciSlovak
• mrmrajočSlovenian
• mrmljanjeSerbian
• sorlande, susande, brusande, mumlandeSwedish
• ซึ่งพูดพึมพำThai
• mırıltılıTurkish
• 低語的Chinese (Trad.)
• дзюрчанняUkrainian
• دھیمی متواتر آوازUrdu
• thuộc âm rì rầmVietnamese
• 低声的Chinese (Simp.)