- οὐκ (ouk) (before vowel with spiritus lenis)
- οὐχ (oukh) (before vowel with spiritus asper)
- οὔ (oú) (pausal form)
οὐ • (ou)
- not (indicates negation)
Οὐ (Ou) is the indicative negation (i.e. of facts, statements), where μή (mḗ) is the subjunctive negation (i.e. of will, thought). It usually immediately precedes the word (most often a verb) which it negates. Double negatives are frequent in Ancient Greek.