Antiloidoreō means to revile back, insult in return, or return abuse for abuse. The prefix anti (against/in return) combined with loidoreō (to revile/abuse verbally) describes the natural human impulse to return insults with insults. Used in 1 Peter to describe what Christ did not do when He suffered.
Peter's use of antiloidoreō in 1 Peter 2:23 is the heart of Christian counter-cultural suffering: Christ, when reviled, did not revile in return. This is not passive weakness but active trust in the just Judge. The Christian who absorbs suffering without retaliation is most fully imitating Christ — entrusting themselves to the One who judges justly.