Here's what rhymes with foundly.
soundly roundly unsoundly profoundly Words that almost rhyme with foundly
foundry loudly hourly sourly housefly howdy county bounty proudly stoutly downy rowdy bouncy dowdy dourly houri jowly townie flouncy townee cloudy dowry devoutly lousy gouty brownie cowrie frowsy mousy frowzy mouthy slouchy mousey towhee scroungy drowsy grouchy grouchier debauchee paramountcy