Here's what rhymes with sturdiest.
wordiest nerdiest Words that almost rhyme with sturdiest
dirtiest chirpiest earliest burliest earthiest earthliest pearliest perkiest jerkiest worthiest murkiest curliest nerviest scurviest curviest thirstiest worldliest quirkiest unearthliest subservient unworthiest noteworthiest praiseworthiest unworldliest luxuriant