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Definition of excess : 1. An undue indulgence of the appetite; transgression of proper moderation in natural gratifications; intemperance; dissipation.
2. The degree or amount by which one thing or number exceeds another; remainder; as, the difference between two numbers is the excess of one over the other.
3. The state of surpassing or going beyond limits; the being of a measure beyond sufficiency, necessity, or duty; that which exceeds what is usual or prover; immoderateness; superfluity; superabundance; extravagance; as, an excess of provisions or of light.

Synonyms:

beyond, contributory, hyper-, superfluous, discharge, tautological, extravagantness, superfluousness, rest, dearth, supernumerary, inundation, unornamented, assurance, abundance, wrong, dissipation, excessiveness, barbarism, exceptional, atrocity, overkill, more than, exuberance, balance, bullying, brutalities, pension off, redundance, plain, exorbitance, trim, nimiety, decadence, special, redundant, actuarial, scanty, inclination, additional, oversupply, embarrassment, pay off, extra, too much, extravagancy, waste, free, wasted, more, spare, surplus, excessive, ease out, adjuster, overage, refuse, overmuchness, maltreatment, addition, human nature, comprehensive, plethora, overplus, retire, lack, savagery, supplement, over and above, bare, profusion, overrun, overly, overflow, too, immorality, overmuch, sin, purposeless, schtick, collision damage waiver, villainy, depravity, actuary, supererogatory, repletion, otiose, give someone notice, unembellished, complement, pointless, instinct, behavior, fire, unneeded, carrier, overdose, superfluity, plenty, residue, dismiss, abuse, disposition, posture, senseless, redundancy, spirit, remainder, evil, superabundance, broker, unnecessary, benefit, fat, overstock, outlook, surplusage, overcharge, overweight, inhumanity, leftovers, iniquity, conduct, surfeit, lay off, pleonastic, margin, cruelty, over, intemperance, overcapacity, glut, pink slip, leavings, de trop, enormity, tautologic, overload, inordinateness

wastefulness (part of speech: noun)

gluttony, thriftlessness, lavishness, pound-foolishness, opulence, overabundance, wastefulness, prodigality, overindulgence, profuseness, extravagance, immoderation, indulgence

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