extravagant
adj
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Extreme; wild; excessive; unrestrained.
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Exorbitant.
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Profuse in expenditure; prodigal; wasteful.
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Exceeding the bounds of something; roving; hence, foreign.
in the lap of luxury
How often have the words extravagant and in the lap of luxury occurred in a corpus of books? (source: Google Ngram Viewer )