Self-taught (adjective)

1. Having acquired knowledge or skills through one's own efforts and without formal instruction or guidance.
2. Acquired as a result of one's own actions or choices.

Origin:

Composed of the word "self" meaning "oneself" and "taught" meaning "having been taught or instructed".

Examples:

1. He was a self-taught musician, having taught himself to play the guitar.
2. She was a self-taught artist, having never received formal training.
3. He was a self-taught computer programmer, having learned through online tutorials and experimentation.
4. The language was self-taught through immersion and practice.
5. The self-taught chef had a unique and innovative approach to cooking.