Grammar / Miscellaneous / Indeclinable proper noun

Proper noun that does not change its endings based on case or number.

Examples

• Ἀβραὰμ ἐγέννησεν τὸν Ἰσαάκ
  Abraham begat Isaac
• Ἀββᾶ ὁ Πατήρ
  Abba, Father