Is it wrong to say the decision taken is averse to your performance?

Answer 1

The word averse means 'disliking (something); reluctant or unwilling (to do something)':

'Very fair-skinned people are frequently averse to being too long in the sun.'; 'Some people are averse to buying things even when they need them; they are averse to spending money.'

So, a decision taken wouldn't be described as averse, though you could say 'I'm averse to accepting the decision.'

Other terms, including the word adverse, might better suit the idea you want to convey. Adverse means (an effect which is) negative, harmful, or against the best interests of (a person, event, and so on).

For example, say you are playing a team sport and the decision is taken to change your position in the team to one in which you believe you don't perform as well. This decision could prove 'adverse to your performance'; that is, it might have a negative affect on the results you achieve.

In the same way, if you are studying a subject and a decision is made to pair you for study with someone you don't get on well with, or to require you to attend lectures which mightn't be the best choice for your subject, that decision might also prove to be 'adverse to your performance'.

Instead of using the word 'adverse' you could say 'I believe the decision taken is contrary to my best interests.', or 'I feel the decision taken will be harmful to my performance.', or you might ask, 'Do you think the decision taken could prove unfavorable to my performance?'.