Fondness rhymes with:
blandness, blindness, kindness, sandness, soundness, awkwardness, backwardness, badness, baldness, blandness, blessedness, blindness, bloatedness, boldness, coldness, crookedness, discontentedness, fadness, farsightedness, 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
Fondness sounds like:
fainting, faintness, fandango, fending, finding, findings, fomenting, fontanez, foundation's, foundations, founding, fountains, funding