I would say forgiveness is the most virtuous one. Reason being is that it's the most challenging one. To be wronged by a person not only once but time and time again to still forgive them? It's truly a virtue that I think would even change the most meanest person cause I believe eventually they would begin to be convicted of their wrong doing.
One can be honest yet honestly hate you.
One can be loyal yet be loyal to the wrong thing for the wrong reasons.
One can have empathy but it's limited if you haven't experienced a thing that another has.
One can have compassion yet without empathy it wouldn't be as potent.
Humility? A close second for me..lol
One can be kind but be selective with their kindness.
Would love to get a nice discussion going!