1. Dep:

2. to set oneself against, oppose, withstand , τινι (Herdotus Historicus), etc.; οὐκ ἐναντιώσομαι τὸ μὴ οὐ γεγωνεῖν I will not refuse to speak, (Aeschulus Tragicus); τοῦτό μοι ἐναντιοῦται πράττειν this prevents me from doing, (Plato Philosophus)

3. to contradict, gainsay , (Euripides), etc.

4. of the wind, to be adverse , (Sophocles Tragicus) (ML)