Untamed (adjective)

1. Not domesticated or trained.
2. Not controlled or suppressed.

Origin:

Early 17th century, from un- + tamed, past participle of tame.

Examples:

1. The untamed tiger roamed the jungle.
2. The river was an untamed force of nature.
3. Her untamed spirit inspired many.
4. The untamed winds made sailing treacherous.
5. The party was filled with untamed energy.