The undomesticated state of a wild animal
After mending the lion's leg, we returned him to the wild.

(chiefly in the plural) a wilderness

To commit random acts of assault, robbery, and rape in an urban setting, especially as a gang.

Untamed; not domesticated; specifically, in an unbroken line of undomesticated animals (as opposed to feral, referring to undomesticated animals whose ancestors were domesticated).
Przewalski's horses are the only remaining wild horses.

From or relating to wild creatures.
wild honey

Unrestrained or uninhibited.
I was filled with wild rage when I discovered the infidelity, and punched a hole in the wall.

Raucous, unruly, or licentious.
The fraternity was infamous for its wild parties, which frequently resulted in police involvement.

Visibly and overtly anxious; frantic.
Her mother was wild with fear when she didn't return home after the party.

Disheveled, tangled, or untidy.
After a week on the trail without a mirror, my hair was wild and dirty.

Enthusiastic.
I'm not wild about the idea of a two day car trip with my nephews, but it's my only option.

Inaccurate.
The novice archer fired a wild shot and hit her opponent's target.

Exposed to the wind and sea; unsheltered.
a wild roadstead

Hard to steer; said of a vessel.

(of a knot) Not capable of being represented as a finite closed polygonal chain.

Amazing, awesome, unbelievable.
Did you hear? Pat won the lottery! - Wow, that's wild!

Able to stand in for others, e.g. a card in games, or a text character in computer pattern matching.
In this card game, aces are wild: they can take the place of any other card.

Inaccurately; not on target.
The javelin flew wild and struck a spectator, to the horror of all observing.