Here's what rhymes with preppiest.
peppiest Words that almost rhyme with preppiest
edgiest pettiest stretchiest tetchiest sketchiest sweatiest airiest dressiest leggiest heaviest prescient veriest lariat emptiest lengthiest wariest hairiest fleshiest fleshliest teariest variant chariot wealthiest deadliest recreant scariest sexiest cheviot cleanliest heftiest smelliest peskiest testiest zestiest friendliest homeliest comeliest cerement stealthiest invariant uncleanliest proletariat unfriendliest secretariat commissariat