Blessedness rhymes with:
crookedness, handedness, lightheadedness, preparedness, vividness, wickedness, awkwardness, backwardness, badness, baldness, blandness, blindness, bloatedness, boldness, coldness, crookedness, discontentedness, fadness, farsightedness, fondness, goodness, handedness, hardness, high-spiritedness, kindness, lightheadedness, low-spiritedness, madness, mindedness, nearsightedness, poor-spiritedness, preparedness, public-spiritedness, redness, rudeness, sadness, sandness, shrewdness, soundness, spiritedness, vividness, weirdness, wickedness, wildness
Blessedness sounds like:
blackstone's, blasting, blockading, boyleston's, boylston's