Here's what rhymes with lengthily.
silly hilly villi filly really chilly lily chile chili willy billy shrilly chilli frilly dilly gillie slily worthily shabbily pithily meagrely unworthily healthily sketchily patchily stealthily tranquilly rockabilly sombrely unhealthily waterlily involuntarily Words that almost rhyme with lengthily
theory weary cheery wiry dearie miry leery teary beery deary smeary dreary bleary city filthy sickly thickly thinly fitly silky hippie silty filmy fishy sissy finny hippy shitty fizzy shimmy shinny nearly simply fifty merely busy guilty pity yearly dearly fiercely guinea richly singly witty dimly dizzy mini sticky giddy kingly milky skinny stiffly dinghy pithy bilge ditty kitty shifty smithy frizzy gimme jiffy kiddie ninny picky piggy tinny whinny bitchy bitty fifthly jimmy middy biddy biggie chippy clearly quickly pretty sixty kidney severely sincerely swiftly chimney risky whiskey grimly misty privy tricky whisky windy dingy flimsy gypsy prickly thrifty glibly grisly gritty grizzly mitre stingy stringy tipsy flinty intercity kinky limply nimbly perigee pigmy pygmy skimpy spindly springy whimsy wispy austerely frisky menisci nifty pinky primly quickie solidi weirdly clingy dinky drizzly fluidly horridly jitney pimply pinkie pixie prissy slinky squishy stinky trimly wimpy committee strictly briskly princely wintry feverishly fixedly ignominy languidly bristly colicky crisply lucidly crispy deviltry pigsty crinkly crushingly glitzy insincerely luridly rabidly swimmingly twisty sophistry reentry sacristy crudity elastically synonymy cavalierly unblushingly transitively distinctly subcommittee succinctly indecisively indistinctly propinquity