adjective, growl·i·er, growl·i·est. resembling a growl in pitch and harshness: This cold has made my voice growly. irritable; grouchy.

What do you mean by growling?

to utter a deep guttural sound of anger or hostility: The dog growled at the mail carrier. to murmur or complain angrily; grumble. to rumble: The thunder growled.

What does growl mean in literature?

to utter (words) in a gruff or angry mannerhe growled an apology.