Antonymic means having the opposite meaning. There are several synonyms for this word, including opposite, contrary, reverse, conflicting, and incompatible. These words suggest the idea of two things being completely different or going in opposite directions. Opposite and contrary both imply a contrast in nature, while reverse suggests a complete reversal in direction or order. Conflicting and incompatible suggest a lack of harmony or agreement between two things. All these words can be used to describe situations where two things are in opposition or contrast to each other, and where their meanings are essentially opposite.