Disimprovement

[...] '[T]is very reaſonable, that all ſhould be obliged to the Law of Justice. [...] And as to the Public, 'twould be all one as if there were no Property; and then for want of Encouragement and Security, the final iſſue of the matter would be, an utter neglect and diſimprovement of the Earth, and a continual diſturbance of the Public Peace.

Source: wiktionary

From day to day the intelligent student can watch the course of the affection before him, notice the finest shades of improvement or disimprovement, test the results of treatment, and verify for himself the truth of both diagnosis and prognosis.

Source: wiktionary

There is an appeal to methods like simulated annealing and threshold acceptance that make no recourse to memory, but that operate simply by imposing a monotonically declining ceiling on objective function levels or degrees of disimprovement (treated probabilistically or deterministically).

Source: wiktionary

[Marina] Carr's transposition of Aeschylus into the twenty first century, somewhat removed from the tragedic forms of ancient Greek writing, reflects some of the disimprovements of contemporary Irish life brought about by power and greed.

Source: wiktionary