The phrase 'sharp cornered' describes an object or shape with an angular and pointed edge. Its antonyms, on the other hand, would denote a smooth or curved surface. Some possible antonyms for the phrase could be 'rounded', 'blunt', 'smooth', 'curved', or 'soft-edged'. These words point to objects that lack the defined edge or corner that sharp cornered implies. For example, a round ball is the opposite of a sharp-edged one. Similarly, a circular bench is the antithesis of a square or rectangular one. Contextually, using antonyms for 'sharp cornered' could indicate safety, comfort, or simplicity instead of a harsh, pointed, or dangerous object.