The term 'less smooth' can be described by the crossword solutions of chunkier (8 letters), ROUGHER (7 letters), knobbier (8 letters), jerkier (7 letters), and raspier (7 letters). Chunkier implies that something is composed of large, distinct pieces. ROUGHER suggests that something is not even or level. Knobbier implies that something has bumps or protrusions. Jerkier implies that something is abrupt or sudden. Raspier implies that something is harsh or grating. All of these words together suggest that something is not smooth, but rather rough and uneven.