Bell-shaped refers to an object that resembles the shape of a bell, wider at the bottom and narrow at the top. There are several antonyms for the word, such as cylindrical, conical, flat, round, square, triangular, irregular, and many more. While cylindrical is a straight and uniform shape, a conical object has a pointed tip at the top. Flat objects have no curves or curves that do not flow uniformly. Round objects have no pointed or angular edges. Square objects have four equal sides and the same amount of corners. Triangular objects have three sides and angles, while irregular objects have no fixed shape. These antonyms can help to describe different shapes with ease.