crying (part of speech: adjective)
voicing (part of speech: verb)
lamenting (part of speech: verb)
- I've been groaning over you: but I might have known you'd find some way to slip out of trouble. - "Put Yourself in His Place", Charles Reade.
- I am worn with my groaning, Rest I find none! - "Jeremiah", George Adam Smith.
- He was lying with his head between his hands, and was groaning, not loudly, but very bitterly. - "Ralph the Heir", Anthony Trollope.