adverb (fukushi); noun or participle which takes the aux. verb suru; adverb taking the 'to' particle
mumbling; chewing one's wordsonomatopoeic or mimetic word
Generated: This word is used to describe the action of mumbling or chewing one's words, often when someone is talking unclearly or with their mouth full.
All I could mumble in response was that when I was a man of fifty, my mother would lean out of the window when I left and remind me not to drive too fast.
Lingaku