Muttered

He muttered a curse.

He muttered complaints against the school.

He muttered something under his breath.

Jose muttered the answer to the question asked by the teacher.

Tom muttered something under his breath.

"They are not asleep yet," muttered the witch to herself.

"I knew she was a 'troublemaker'," Rebecca muttered.

Tom muttered a curse.

Tom muttered something that I couldn't hear.

Sami muttered something that I couldn't hear.