Someone who is hostile to, feels hatred towards, opposes the interests of, or intends injury to someone else.
He made a lot of enemies after reducing the working hours in his department.
Crush the enemy!
A hostile force or nation; a fighting member of such a force or nation.
rally together against a common enemy.
An alliance of such forces.
Something harmful or threatening to another (quote-journal)
The very thing the 16 skiers and snowboarders had sought — fresh, soft snow — instantly became the enemy. Somewhere above, a pristine meadow cracked in the shape of a lightning bolt, slicing a slab nearly 200 feet across and 3 feet deep. Gravity did the rest.