2 Verbs to Use for the Word impairment

Wieland did not fear impairment of his originality by study; on the contrary, he was convinced at an early date that a lively, fertile spirit found its best stimulus not only in the adaptation of material that was already well known, but also in the translation of extant works.

But even partial approach to intoxication involves its proportionate impairment of nervous integrity, and therefore just so much diminution of muscular force.

2 Verbs to Use for the Word  impairment