mossgrown

moss·grown

 (môs′grōn′, mŏs′-)
adj.
1. Overgrown with moss.
2. Old-fashioned; antiquated: mossgrown ideas about family life.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.