1 wasteful, lavish, profligate, prodigal, improvident, reckless, excessive, spendthrift, profuse, extreme, immoderate:
She cannot afford to maintain her extravagant way of life for long.
2 unrestrained, uncontained, wild, outrageous, preposterous, immoderate, ridiculous, foolish, fanciful, unreasonable, absurd, impractical; undeserved, unjustified, unjustifiable:
The speaker lavished extravagant praise on the award winners.
3 expensive, costly, extortionate, unreasonable, overpriced, exorbitant, high; dear; Colloq steep:
That trip to Istanbul by private jet was extravagant to say the least.
4 gaudy, garish, ostentatious, showy, ornate, flashy, loud, flamboyant; exaggerated, high-sounding:
She appears at parties wearing the most extravagant costumes.