Words That Rhyme With "Straightness" :
2 syllables:
anus, betas, chasteness, cuteness, Dana's, datas, fatness, fitness, flatness, flatus, fleetness, gayness, greatness, heinous, hotness, Janus, lateness, lightness, muteness, neatness, pastness, patness, planeness, slightness, squatness, staidness, status, stoutness, sweetness, taintless, tautness, tightness, vagueness, wasteness, wetness, whiteness, witness
3 syllables:
acuteness, afflatus, astuteness, awayness, completeness, conatus, decayedness, devoutness, diluteness, dismayedness, Donatus, effeteness, eyewitness, hiatus, humaneness, innateness, meatus, mundaneness, nasuteness, oblateness, opaqueness, ornateness, pandanus, pesetas, petiteness, Pilatus, politeness, profaneness, remoteness, sedateness, Silvanus, unfitness
4 syllables:
Cincinnatus, comitatus, farawayness, impoliteness, incompleteness, inhumaneness, mediateness, obsoleteness, saleratus, unpoliteness
5 syllables:
deliberateness, determinateness, elaborateness