pessimize

To take a pessimistic view of; to speak of in a negative or pessimistic way.

Mr. [Benjamin] Disraeli's Church appointments have been received with general satisfaction. There are two relations of the matter; the one as regards the prudence and astuteness of the dispenser of good things, and the other as relates to the general good and efficiency of the Church itself. It is equally possible to optimize and pessimize either aspect.

To make (something) pessimal or the worst; (in a weaker sense) to make (something, such as a computer program) less efficient.

pessimizing compiler [...] A compiler that produces object [...] code that is worse than the straightforward or obvious hand translation. The implication is that the compiler is actually trying to optimize the program, but through excessive cleverness is doing the opposite. A few pessimizing compilers have been written on purpose, however, as pranks or burlesques.

Designing a window without the building, a light without the room, or a motor without the machine it drives works as badly as designing a pelican without the fish. Optimizing components in isolation tends to pessimize the whole system – and hence the bottom line.

To think like a pessimist; to believe the worst.

The pessimising and desponding tone of the Tory Foreign Minister's correspondence, in the early part of 1859, can hardly be read without a shudder.

Glancing at the developments of individualities in memberdom, it may be said that Lord Elebo availed himself of the last appearance in the House of the Army Estimates to repeat the attacks on the physical condition of the men of the service which he had so elaborately made a week or two ago; and he pessimised on the subject, if possible, with the same exaggeration as before.

To become pessimal or the worst.

Without an effort to integrate the various design disciplines, for instance, individual subsystems (such as the HVAC system) may be optimized, but the system as a whole may be "pessimized."