Gibborim (from the singular גִּבֹּר, גִּבּוֹר gibbor) 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).
The word gibborim is used in the Tanakh over 150 times and applied to men as well as lions (Proverbs 30:30), hunters (Genesis 10:9), soldiers (Jeremiah 51:30) and leaders (Daniel 11:3). The word is also applied to the David's Mighty Warriors (known as David's Mighty Men or the Gibborim; הַגִּבֹּרִ֛ים hagGībōrīm, "The Mighty Ones"), a group of 37 men who fought with King David and are identified in 2 Samuel 23:8–38.
In modern Hebrew the word "gibbor" (the singular form of gibborim), equates with "hero" (if noun), or "brave" (if adjective).