疏松 is a stative verb (adjective) describing something that is loose, not compact, or puffy in texture. It commonly applies to soil (疏松的土壤), bread or cake (疏松的面包), or other materials where particles are not tightly packed. Unlike the general word 松 (loose), 疏松 emphasizes a structural quality rather than a state of being untied or relaxed. In some contexts it can also function as a transitive verb meaning 'to loosen' (e.g., 疏松土壤), but the primary use is adjectival.