Generally you can't negate morally right to mean morally wrong because there are some actions that are neither. Same for right and wrong in general. Siting here eating soup is not morally right, but it's not morally wrong, either. So "eating soup" would be in the "not morally right" category but it wouldn't be in the "morally wrong" category.
Comments
Siting here eating soup is not morally right, but it's not morally wrong, either. So "eating soup" would be in the "not morally right" category but it wouldn't be in the "morally wrong" category.
P and Q are contraries if they can't both be true but can both be false (e.g. 'X is right' and 'X is wrong').
P and Q are contradictories if they can't both be true and can't both be false (e.g. 'X is dead' and 'X is alive').
Subcontraries can't both be false but can both be true (e.g. 'Some dogs are furry' and 'Some dogs aren't furry').
For more about these kinds of relations, check out the Square of Opposition.
https://en.m.wikipedia.org/wiki/Square_of_opposition
QED