Adversely affect (6)
I believe the answer is:
impair
(Other definitions for impair that I've seen before include "Weaken, damage" , "Hinder" , "Reduce" , "Spoil strength, quality of" , "Damage or injure" .)
I believe the answer is:
impair
(Other definitions for impair that I've seen before include "Weaken, damage" , "Hinder" , "Reduce" , "Spoil strength, quality of" , "Damage or injure" .)