The word 'well-appointed' is a compound adjective formed from native English elements. The core verb 'appoint' entered English from Old French with meanings related to fixing, arranging, and assigning. Over time, it developed the specific sense of equipping or furnishing a place. The adverb 'well', of Germanic origin, is prefixed to intensify the quality, indicating that the furnishing is done thoroughly and satisfactorily. The '-ed' suffix marks its participial adjective form, describing a state resulting from the action. Thus, the literal logic is of a space that has been 'arranged or equipped in a good manner,' leading to its modern meaning of being comfortably and completely furnished.

Structure: well (in a good manner) + appoint (to equip) + ed (adjective suffix) - well: Old English. An adverb meaning 'in a good or satisfactory manner'. In this compound, it functions as an intensifier. - appoint: Middle English, from Old French 'apointer', meaning 'to arrange, settle'. In this context, it carries the sense of 'to equip or furnish'. - ed: Old English. A suffix forming past participles of verbs, which are commonly used as adjectives.