Word:

pessimal

Adj.1.pessimal - of an organism's environment; least favorable for survival
Synonyms: pessimum
pessimal - /pes'im-l/ (Latin-based antonym for "optimal") Maximally bad. "This is a pessimal situation." Also "pessimise" To make as bad as possible. These words are the obvious Latin-based antonyms for "optimal" and "optimise", but for some reason they do not appear in most English dictionaries, although "pessimise" is listed in the OED.
pessimum, worst
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Pesane
Pesanted
pesantran
pesantren
Peschito
Pese
Pesent arms
Peseta
pesewa
Pesh Merga
Peshawar
Peshito
peshmerga
Pesky
Peso
Pessary
-- pessimal --
pessimising compiler
Pessimism
Pessimist
pessimistic
Pessimistical
pessimistically
Pessimize
pessimum
Pessulus
Pest
Pestalozzian
Pestalozzianism
Pester
pestered
Pesterer
pestering
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