(a.) Overgrown with moss.

ablation abrasion atomization attrition beating breakup brecciation coming apart comminution corrosion cracking crushing decadent decay declining decomposition decrepit degenerate degradation deteriorating detrition dilapidated dilapidation disintegrating disintegration disjunction disorganization dissolution draining drooping dusty dwindling ebbing effete erosion fading failing falling flagging fragmentation fragmenting fusty going to pieces gone to seed granulation granulization grating grinding incoherence infirm languishing levigation marcescent mashing mildewed moldering moldy moss-grown moth-eaten musty pining poor poorish pounding powdering ravages of time regressive resolution retrograde retrogressive rotten rotten at ruined ruinous rusty shredding shriveling sinking sliding slipping slumping smashing stale subsiding tabetic time-scarred timeworn trituration unfirm unsolid unsound unstable unsturdy unsubstantial waning wasting wear wear and tear wilting withering worn worsening