Plummest is an adjective that describes something as being the fullest or thickest in shape, like a plump fruit. Some synonyms for plummest include bulkiest, chubbiest, heaviest, amply, corpulent, fecund, beefy, and tubby. Each synonym alludes to being rounded or filled out, implying fullness or weight. Whether you use one of these synonyms or plummest itself, they offer an effective way to describe something with thickness and roundness. So next time you want to describe something as full or heavy, try using plummest, bulky, or one of the many synonyms that convey these qualities.