In their own eyes they flatter themselves too much to detect or hate their sin.
NMVFor he flatters himself in his own eyes, until his iniquity be found to be hateful.
OJB[36:3]For he flattereth himself in his own eyes, until his avon (iniquity) be found to be hateful.
RVFor he flattereth himself in his own eyes, that his iniquity shall not be found out and be hated.
T4TBecause they are very proud, they do not think that God will discover their sins and condemn them (OR, they do not think about their sins and hate themselves for it).