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Gibborim (גּבּר, גּבּור) is a Hebrew word that can be glossed "mightiest" which is an intensive for gabar (גּבר) that can be glossed "mighty". Many times it is used of people who are valiant, mighty, or of great stature. There is some confusion about Gibborim as a class of beings because of its use in Genesis 6:4 which describes the Nephilim as mighty (gibborim).
In modern Hebrew the word "gibbor" (the singular form of gibborim), equates with "hero" (if noun), or "brave" (if adjective).