Synonym for extravagant is "unrestrained"

big [adjective]

means "behaviour"
lavish, flashy, ostentatious, excessive, generous, extravagant

effusive [adjective]

means "expansive"
copious, extravagant, unrestrained, abundant

exaggerated [adjective]

means "farfetched"
extravagant, distorted, overwrought, sensational, spectacular, overstated

excessive [adjective]

means "extreme"
extremist, exceeding, extravagant, fanatic, intemperate, fanatical

exorbitant [noun]

means "excessive"
extravagant, unreasonable, superlative, immoderate, unfair, unjust

extortionate [adjective]

means "outrageous"
exorbitant, unreasonable, extravagant, rapacious, severe, wasteful

extreme [adjective]

means "excessive"
extremist, exceeding, extravagant, fanatic, intemperate, fanatical

fanatic [noun]

means "excessive"
extremist, extravagant, extreme, intemperate, fanatical, immoderate

fanatical [adjective]

means "excessive"
extremist, exceeding, extravagant, fanatical, intemperate, extreme

fanciful [adjective]

means "capricious"
extravagant, fancy, irregular, whimsical

fancy [adjective]

means "behaviour"
capricious, extravagant, fanciful, irregular, whimsical

fantastic [adjective]

means "outlandish"
farfetched, erratic, implausible, preposterous, extravagant, extreme

far-fetched [adjective]

means "fantastic"
extravagant, distorted, sensational, spectacular, overstated

fast [adjective]

means "characteristic"
dissipated, dissolute, extravagant, prodigal, profligate, reckless

- translate fast

idle [adjective]

means "frivolous"
wasteful, extravagant

immoderate [adjective]

means "excessive"
extremist, exceeding, extravagant, fanatic, intemperate, fanatical

implausible [adjective]

means "outlandish"
farfetched, erratic, fantastic, preposterous, extravagant, extreme

imprudent [adjective]

means "excessive"
improvident, exorbitant, immoderate, extravagant, inordinate, lavish

inordinate [adjective]

means "excessive"
improvident, exorbitant, immoderate, imprudent, extravagant, lavish

overstated [adjective]

means "farfetched"
extravagant, distorted, overwrought, sensational, spectacular, exaggerated

preposterous [adjective]

means "outlandish"
farfetched, erratic, implausible, fantastic, extravagant, extreme

prodigal [adjective]

means "profligate"
extravagant, squandering, lavish, profuse, reckless, wasteful

profligate [adjective]

means "prodigal"
extravagant, squandering, lavish, profuse, reckless, wasteful

profuse [adjective]

means "lavish"
munificent, abundant, exuberant, extravagant, lush, improvident

radical [adjective]

means "revolutionary"
excessive, seditious, refractory, extravagant, extreme, fanatical

rank [adjective]

means "complete"
extravagant

romantic [adjective]

means "fanciful"
idyllic, imaginary, extravagant, quixotic, fabulous, fictitious

seditious [adjective]

means "revolutionary"
excessive, radical, refractory, extravagant, extreme, fanatical

sweeping [adjective]

means "overstated"
exaggerated, extravagant, hasty, unqualified

thriftless [adjective]

means "wasteful"
profligate, prodigal, squandering, spendthrift, extravagant, negligent

unconscionable [adjective]

means "excessive"
extravagant, immoderate, exorbitant, towering, unreasonable, unjustifiable

undue [adjective]

means "unjustified"
unjust, unearned, unmerited, disproportionate, extravagant, forbidden

unearned [adjective]

means "unjustified"
unjust, undue, unmerited, disproportionate, extravagant, forbidden

unimaginable [adjective]

means "outlandish"
farfetched, erratic, implausible, preposterous, extravagant, extreme

unjustified [adjective]

means "undue"
unjust, unearned, unmerited, disproportionate, extravagant, forbidden

unmerited [adjective]

means "unjustified"
unjust, unearned, undue, disproportionate, extravagant, forbidden

unreasonable [adjective]

means "excessive"
extravagant, exorbitant, superlative, immoderate, unfair, unjust

voluptuous [adjective]

means "sensual"
hedonistic, epicurean, luxurious, extravagant, indulgent, sumptuous

wanton [adjective]

means "lavish"
extravagant, frivolous, capricious, luxurious, elegant, magnificent

wild [adjective]

means "quylity"
extravagant, impracticable, reckless, rash, fantastic

- translate wild

extravagantly [object]

means "wastefully"
lavishly, expensively, beyond one's means, without restraint, immoderately, rashly

abundantly [object]

means "generously"
easily, profusely, openly, freely, extravagantly

divertissement [noun]

means "spectacular"
extravagant show, fantasy, lavish event, extravaganza, fling

extravaganza [noun]

means "spectacular"
extravagant show, fantasy, lavish event, divertissement, fling

fast [object]

means "characteristic"
extravagantly, prodigally, recklessly, wildly