When it comes to finding synonyms for the word "crustier", several alternatives can effectively convey the intended meaning. One suitable option is "grittier". This term encapsulates the idea of something being coarse, rough, or abrasive, suitable for describing a rough exterior or personality. Another synonym worth considering is "craggier". This term denotes a rougher or more rugged appearance, commonly utilized when describing the surface of landforms or facial features. Additionally, "more abrasive" can also serve as a synonym for "crustier", implying a harsh, cutting, or prickly nature. These synonyms provide variety in language choice, ensuring writers can accurately describe a crusty or unpleasant quality.