luxuriously
Word family
Synonym discussion
Sense: adverb/1
'Luxuriously' is the broadest everyday choice when something feels both expensive and physically comfortable. 'Lavishly' stresses abundance: a room lavishly decorated may overflow with gold, flowers, or gifts, even if comfort is not central. 'Opulently' is more formal and points to grandeur and showy wealth, especially in writing about hotels, palaces, or interiors. 'Sumptuously' is slightly more literary and usually highlights rich textures, colors, or food. You would say a suite was luxuriously appointed when it felt deeply comfortable, lavishly decorated when many costly details were added, opulently furnished when the whole space signaled wealth, and sumptuously draped when the fabrics themselves created the rich effect.
Etymology
Built in English from 'luxurious' and the adverb ending '-ly'. 'Luxurious' goes back through French-influenced English forms to Latin 'luxuria', a word for excess, abundance, and self-indulgence. Over time, that idea of going beyond what is necessary shifted toward the modern sense of costly comfort and pleasurable richness. The adverb keeps both strands: it can describe an expensive setting or the bodily pleasure that such comfort creates.