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Definition of immoderate : Not moderate; exceeding just or usual and suitable bounds; excessive; extravagant; unreasonable; as, immoderate demands; immoderate grief; immoderate laughter.

Synonyms:

any, de trop, too much, extreme, extraordinary, far, abnormal, over-the-top, overdone, undue, study at excessive, overstated, extortionate, unconscionable, radical, extremist, excess, exaggerated, stark, ultra, unreasonable, usurious, overmuch, steep, a bit much, inordinate, all-fired

crapulent, piggish, greedy, rapacious, wolfish, boundless, excessive, intemperate, overindulgent, voracious, insatiable, hoggish, omnivorous, extravagant, gluttonous, indulgent

prodigal, thriftless, lavish, wasteful, profuse, pound-foolish, opulent, unrestrained, profligate, unconstrained

outrageous, redundant, copious, surplus, overflowing, gratuitous, exorbitant, superfluous, overabundant, superabundant

Usage examples:

• This extraordinary phenomenon, the confusion of the poor girl, our position- everything, in fact, struck me as so comical, that I burst into the most immoderate laughter, which compelled me to give up the undertaking. - "The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons", Jacques Casanova de Seingalt.
• The alliance with an inexperienced girl of inferior birth, and a perhaps immoderate ambition, has taxed your generosity; and though the store may be inexhaustible, it is not truly the married state when a wife subjects the husband to such a trial. - "The Complete Project Gutenberg Works of George Meredith", George Meredith.
• Not long after Chaucer's death, St. Bernardino of Siena grants the same permission, even while rebuking the immoderate abuse of marital authority. - "Chaucer and His England", G. G. Coulton.