As adjectives the difference between roily and rolly
is that roily is (of water) muddy, cloudy (having lots of sediment) while rolly is (informal) rolling; having the ability to roll, usually due to wheels attached on the bottom.
roily
English
Adjective
(er)
(of water) muddy, cloudy (having lots of sediment)
turbulent
rolly
English
Adjective
(-)
(informal) Rolling; having the ability to roll, usually due to wheels attached on the bottom.