from σύν and a derivative of a presumed compound of εὖ and a derivative of ἔχω (meaning to be in good condition, i.e. (by implication) to fare well, or feast); to entertain sumptuously in company with, i.e. (middle voice or passive) to revel together:--feast with.
from ἄδικος; (legal) injustice (properly, the quality, by implication, the act); morally, wrongfulness (of character, life or act):--iniquity, unjust, unrighteousness, wrong.