"Soily" is an adjective that describes something that is covered in dirt or soil. There are several synonyms for this word that can convey the same meaning or degree of dirtiness. Some examples include "grubby," "muddy," "filthy," "grimy," and "sooty." These words are great alternatives when describing something that is unclean, such as a garment, surface, or environment. Additionally, words such as "earthy," "sandy," and "loamy" can be used to describe soil itself. These synonyms come in handy when trying to paint a vivid picture of a scene, and can be effective in creating a mood or atmosphere in written or spoken communication.