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EXCESSIVE, IMMODERATE, INORDINATE, EXTRAVAGANT, EXORBITANT, EXTREME mean going beyond a normal limit.

EXCESSIVE implies an amount or degree too great to be reasonable or acceptable.

e.g. excessive punishment

IMMODERATE implies lack of desirable or necessary restraint.

e.g. immoderate spending

INORDINATE implies an exceeding of the limits dictated by reason or good judgment.

e.g. inordinate pride

EXTRAVAGANT implies an indifference to restraints imposed by truth, prudence, or good taste.

e.g. extravagant claims for the product

EXORBITANT implies a departure from accepted standards regarding amount or degree.

e.g. exorbitant prices

EXTREME may imply an approach to the farthest limit possible or conceivable but commonly means only to a notably high degree.

e.g. extreme shyness

lacking restraint in spending money or using resources:

(必要でない物に)浪費する, むだ遣いする; ぜいたくな(wasteful)

e.g. it was rather extravagant to buy both.

costing too much money:

過剰な, 度を越えた; 【物を】(たくさん)使いすぎる, むだにする «with»

〖通例名詞の前で〗豪華な, 派手な〈パーティ･ファッションなど〉

e.g. extravagant gifts like computer games.

exceeding what is reasonable or appropriate; absurd:

〖名詞の前で〗極端すぎて分別がない［ありえない］, ばかげた〈考え･ふるまいなど〉; 〈価格などが〉法外な

e.g. extravagant claims for its effectiveness.

late Middle English (in the sense ‘unusual, unsuitable’): from medieval Latin extravagant- ‘diverging greatly’, from the verb extravagari, from Latin extra- ‘outside’ + vagari ‘wander’.