Weakened
Part of speech: adjective
Definition: Reduced, made less strong.
Part of speech: verb
Definition: To make weaker or less strong.
Example sentence: Pension and health benefits are a cornerstone of union protection. When actors' work is split between two unions, that protection is weakened or, in the worst cases, eliminated. That's not acceptable, and it's one of many reasons merging SAG and AFTRA makes sense.
Vitiated
Part of speech: verb
Definition: To spoil, make faulty; to reduce the value, quality, or effectiveness of something