The term 'sumptuously appointed' can be summarized as having a luxurious and elegant atmosphere. The crossword solution for this term is 'POSH', which is an acronym for 'Port Out, Starboard Home'. This phrase was used to describe the most desirable cabins on ships traveling from England to India in the 19th century, as they were located on the side of the ship that received the most sunlight. Thus, the term 'POSH' has come to mean something that is luxurious and fashionable.