* Όχι (Óchi): This is the most common and versatile way to say "no" in modern Greek. It's suitable for most situations.
* Δεν (Den): This word means "not" and is used before verbs. For example, "Δεν θέλω" (Den thélo) means "I don't want." So, while not a direct translation of "no," it serves the same purpose in many sentences.
The best choice depends on the sentence structure. For a simple, standalone "no," Όχι (Óchi) is your best bet.