Wickedness rhymes with:
crookedness, blessedness, crookedness, handedness, lightheadedness, preparedness, vividness, awkwardness, backwardness, badness, baldness, blandness, blessedness, 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, wildness
Wickedness sounds like:
wasting, weighting, weightings, westinghouse, westinghouse's, wigton's