Hello = Γεια (yá) - or Χαίρετε (khérete) Good morning = Καλημέρα (kaliméra) Good night = Καληνύχτα (kaliníkhta) (The greek "Χ" is pronounced like spanish "J". I have put "kh". It 's a lot heavier than english "H".) If you want more, just ask!

A friendly hello is "yassou!" (Γειά σου)! The "σου" is the friendly "you". "Ya sas" (Γειά σας) is the polite form. Use Lobo's suggestions of "Καλημέρα / Καληνύχτα" to be a little more formal.

Hello orange, " Hello' is " Yahsu " in Greek.