General Use:
* He mumbled a reply, too embarrassed to speak clearly.
* The old man mumbled to himself as he walked down the street.
* The child mumbled a prayer before bedtime.
With Specific Objects:
* She mumbled the words of the song under her breath.
* He mumbled his name on the registration form.
* The detective mumbled the suspect's alibi to himself.
With Adverbs:
* He mumbled softly to avoid being overheard.
* The crowd mumbled angrily after the announcement.
* She mumbled nervously as she waited for her turn.
With Conjunctions:
* She mumbled a few words and then quickly left the room.
* He mumbled something about being busy and hung up the phone.
* The student mumbled an excuse and avoided making eye contact.
These examples show the versatility of the word "mumble" and how it can be used in various contexts to describe the act of speaking indistinctly or quietly.