The Collaborative International Dictionary of English v.0.48:
moss-grown \moss"-grown`\, mossgrown \moss"grown`\, a. Overgrown with moss; mossy. [1913 Webster]WordNet (r) 3.0 (2006):
moss-grown adj 1: overgrown with moss [syn: moss-grown, mossy] 2: (used pejoratively) out of fashion; old fashioned; "moss- grown ideas about family life" [syn: fogyish, moss-grown, mossy, stick-in-the-mud(p), stodgy]