jagged (adj.) Look up jagged at Dictionary.com
mid-15c., from verb jaggen (c.1400) "to pierce, slash, cut; to notch or nick; cut or tear unevenly," Scottish and northern English, of unknown origin. Originally of garments with regular "toothed" edges; meaning "with the edge irregularly cut" is from 1570s. Related: Jaggedly; jaggedness.