adjective
1
BAD : You could stay at one of the big luxurious hotels, but the small hotels are far more reasonable.
GOOD : You could stay at one of the big luxury hotels, but the small hotels are far more reasonable.
BAD : Consumers are offered more and more luxurious goods.
GOOD : Consumers are offered more and more luxury goods.
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To refer to a type or class of hotel, apartment, furniture, services etc, use luxury as a modifier: 'a luxury apartment in the heart of London', 'luxury bedroom suites imported direct from Italy', 'a luxury liner'.
Use luxurious to describe something that is very comfortable and expensive: 'The car's soft cream leather interior was extremely luxurious.'
2
BAD : Many people today do not consider a car as a luxurious thing.
GOOD : Many people today do not consider a car as a luxury.
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a luxury = something that you do not need: 'We can hardly afford to buy food, yet alone waste money on luxuries.'