Weakness rhymes with:
bleakness, preakness, uniqueness, blackness, bleakness, darkness, frankness, harkness, hawkiness, homesickness, likeness, preakness, quickness, sickness, slackness, thickness, uniqueness
Weakness sounds like:
wacksman's, wagging, waging, wagons, waking, washing, wassink, waxing, waxman's, weakening, weakens, weaknesses, weighing, whacking, wheezing, whizzing, wickens, wiggans, wiggins, wishing, wishnick, wisinski, wisneski, wisnewski, wisnieski, wisniewski, wissing, wissink, wojnowski, wozniak, woznick, woznicki, wysong, wyszynski