Rotund describes anything that's plump or round, like a teapot or your chubby Aunt Agnes.

Rotund describes someone who is round in shape, or obese. It's not a compliment. That's why it's probably okay to call Santa Claus rotund, but not your neighbor — at least not to his face! It's fine to call round things rotund, however, like a rotund vase full of flowers, which particularly makes sense when you know that the root of rotund is the Latin word rotundus, meaning round, circular, like a wheel.

Definitions of rotund
  1. adjective
    spherical in shape
    curving and somewhat round in shape rather than jagged
  2. adjective
    excessively fat
    synonyms: corpulent, obese, weighty
    having an (over)abundance of flesh
  3. adjective
    (of sounds) full and rich
    “the rotund and reverberating phrase”
    synonyms: orotund, pear-shaped, round
    (of sound) having marked deepness and body
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