growlingly

intransitive verb

1. to make a low, rumbling, menacing sound in the throat, as a dog does
2. to complain in an angry or surly manner
3. to rumble, as thunder, cannons, etc.

transitive verb

noun

1. the act or sound of growling
2. ☆ Jazz a low, rough, husky, often muted sound produced on a trumpet, trombone, etc.