self-educated 
adjective
Educated largely through one’s own efforts, rather than by formal instruction: he was a self-made and almost self-educated businessman...
- Largely self-educated, Jack London had a love of books and a desire to write, but hadn't had a lot of success as a wordsmith yet.
- In spite of his father's moderate wealth, Chardin was largely self-educated.
- Both from hick towns and largely self-educated, they shared a dark humour and a strong sense of the bizarre.
Derivatives
self-education
- The 3,000 people who buy an independent product are engaged in a kind of cultural exploration which is the very stuff of self-education and growing as a human being.
- He also prefers to keep up his aforementioned self-education - particularly in literature, philosophy and ‘spiritual studies’.
- The only problem, I say, is that in America, I do not see the will for peace, nor for self-empowerment through self-education.