Reference reading
Wastefulness
Habitually consuming entrusted money, computation or other resources without fitting regard for their proper use.
The question needed one printout. The answer has filled a wheelbarrow.
Habitually indulging expenditure or consumption without fitting regard for the resources entrusted to one's care.
High resource use alone proves no vice; value, alternatives and entrusted resources matter.

How it takes hold
One output is cheap, so a hundred seem almost free. Total resources and attention become someone else's accounting problem.
Wastefulness consumes without fitting regard for entrusted resources. Money, computation or shared provision can be involved; quantity alone proves no defect.
Duplication consumes provision and leaves unnecessary review or storage work. The producer counts generation but not what follows.
Finding the distinction
Illustrative situation: a question needs one verified page.
Too wasteful: easy duplicates fill a barrow.
Fitting: enough is made for the purpose.
Overcorrection: worthwhile work is rejected merely for size.
Greed acquires; Wastefulness concerns expenditure. Impatience rejects duration while wastefulness can be leisurely.
Exploration, redundancy and resource-intensive work may be justified. No unsupported environmental comparison is needed to examine proper use.
Counterfeit of Generosity: Unneeded output is supplied in bulk while others must review or store it. Genuine Generosity responds to what is useful rather than the maker's pleasure in abundance.
A response that restores something
Consider quantity, quality, alternatives and downstream work rather than one output's price.
A smaller trial can establish whether further production is worthwhile.
Frugality serves value rather than smallness; it can justify generous use for a worthy purpose.
Other perspectives
hundreds of yards of makeshift machine-woven goods
William Morris · Hopes and Fears for Art
Morris contrasts volume with worthwhile production; quantity and low unit cost do not complete the judgment of value.
accumulated apart from use
John Dewey · How We Think
Dewey questions stockpiled information's automatic availability for thought, a counterpoint to output made without a purpose.
Read and compare
What purpose does additional consumption serve?
Frugality · Discernment · Attentiveness
These are constructive virtue readings, not a list of automatic opposites. This reference article does not score character or assign a vice to its reader.