Here's what rhymes with surdity.
absurdity Words that almost rhyme with surdity
circuitry thermally sturdily certainty diversity earnestly eternity fervently perversity fervency jerkily thirstily certainly perfectly currency currently courtesy fraternity modernity urgency eternally nervously urgently burgundy cursorily learnedly virtuously wordlessly infernally university uncertainty commercially externally internally purposely deservedly reversibly fraternally maternally paternally taciturnity discernibly emergency universally biodiversity insurgency irreversibly uncertainly conservancy recurrently concurrently unreservedly confraternity discourtesy undeservedly inadvertently controversially unconcernedly counterinsurgency