Generally ungradable; comparative and superlative forms are very rare.
The preexisting agreement was still in effect.
Существующее ранее соглашение все еще действовало.
The preexisting conditions were not covered by the insurance.
Предшествующие условия не покрывались страховкой.
preexistinggerund / present participle Functions as the present-participle form of the verb “pre-exist” when used attributively.
preexistgerund / present participle Present-participle adjective used attributively (e.g. “preexisting condition”).