Mumble 504 Absolutely Essential Words Lesson 33
/ˈmʌm.bļ/ (verb)
to speak quietly and utter the words in a way that is difficult to hear or understand, murmur, speak indistinctly, mutter, stutter, talk under your breath, babble, stammer
Often when speaking I mumble my words or speak too quickly. How do I slow down the velocity of my speech and mumble less?
Also, I think the mumbling is either because of the lack of confidence or it is your usual way of speaking. You might have developed this habit because, you were worried about what others might think if you voice your opinions out loud.
Source: https://www.quora.com/
Antonym: enunciate
Adjective: Mumbling