Luxurious means very comfortable and expensive. A luxurious hotel, luxurious fabric, luxuriously soft.
It describes the quality of the thing rather than the price alone, and it works on rooms, materials and long baths. Note the near-neighbour luxuriant, which means growing thickly and abundantly — luxuriant hair, luxuriant vegetation — and is a different word doing a different job. Note luxury; and that the Latin behind it meant excess and rankness rather than comfort, which was originally a criticism.
1adjectiveluxuriousVery comfortable and expensive.
“The hotel had luxurious rooms with marble bathrooms and silk sheets.”
luxurious is a quality of comfort.
Latin luxuriosus comes from luxuria, rankness or excess, from luxus, extravagance. The word was a criticism of overgrowth long before it praised a hotel.
Latin
lū̆xuriōsus — rank, luxuriant, profuse, excessive, immoderate
Old French
luxurios
Middle English
luxurious
English, today
luxurious
Built from
From Middle English luxurious, from Old French luxurios (modern French luxurieux), from Latin lū̆xuriōsus (“rank, luxuriant, profuse, excessive, immoderate”), from lū̆xuria (“rankness, luxury”), from lū̆xus (“extravagance, luxury”). by surface analysis, luxury + -ous.
Etymology from Wiktionary, CC BY-SA