- 1to speak or say something in a quiet voice, in a way that is not clear synonym mutter
- 2 mumble (to somebody/yourself) I could hear him mumbling to himself. mumble something (to somebody/yourself) She mumbled an apology and left. + speech “Sorry,” she mumbled. mumble that… She mumbled that she was sorry.
NAmE//ˈmʌmbl//[intransitive, transitive]Verb Forms present simple I / you / we / they mumble
he / she / it mumbles
past simple mumbled
-ing form mumbling