The last word in the Old Testament is "Amen". It is found at the end of the book of Malachi, which is the last book of the Old Testament.
The word "Amen" is a Hebrew word that means "truly" or "so be it". It is used to affirm or to express agreement with a prayer or statement. It is commonly used in Christian worship services and prayer meetings to signify the end of a prayer or statement.
The last word in the Old Testament is "curse." Specifically, the Hebrew word is "cherem," which means "devoted to destruction" or "anathema." This word is found in Malachi 4:6, which is the final verse of the Old Testament.