喃喃 | nán nán | (onom.) to mutter / to mumble / to murmur | |
咕哝 | gū nong | to murmur / to mumble / to grumble / to mutter | |
嗫嚅 | niè rú | to stammer / to mumble / to speak haltingly | |
念念有词 | niàn niàn yǒu cí | to mumble / to mutter to oneself | |
支支吾吾 | zhī zhī wú wú | to hem and haw / to stall / to stammer / to mumble / to falter | |
叽叽咕咕 | jī ji gū gū | (onom.) to mutter / to mumble / to whisper |