Moaned, past participle of moan. Synonyms in the same form.
Groan
groaned, whined, grumbled, bitched, complained, bemoaned, whimpered, bleated, muttered, griped, murmured, creaked, groused, beefed, sniveled, repined, growled, grouched, bellyached
Wail
wailed, lamented, sighed, mourned, grieved, sorrowed, deplored, weeped, bewailed, elegized
Other
soughed, dejected
All synonyms for moan →