Against, hostile to.
Related to antiparticles or antimatter.
Physically opposite: applied to mountain ranges.
Opposite of, reverse.
Indicating that a game's conventional victory conditions have been reversed: misère.
Counteracting, neutralizing.
Contrasting with the norm.
That reacts with immunoglobins found in the specified animal.
evil
incorrect
incomplete, unfinished
unintentional, mistaken, accidental
unpleasant
poorly, deficiently
not
unhealthy, harmful