Thinly rhymes with:
brinlee, brinley, finlay, finley, ginley, kinley, linley, mackinley, mcginley, mckinlay, mckinley, quinley, tinley
Thinly sounds like:
tamil, tannahill, tannehill, tennell, thomley, timely, tinley, tinnell, toenail, tommy-lee, tonal, tonelli, townley, tuminello, tumminello, tumolo, tunnel, tunnell