Having taught oneself without formal instruction or the help of others.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "self-taught" in a sentence
"The geeks are mostly self-taught, which is why they have to bring in people like D-squared, and even so they're outclassed by Chinese teenagers."
"A former boxer and self-taught architect, his brash style and unabashed criticisms of Japanese society over the past three decades have made him an influential maverick in his home country."
"Christopher Rees is another self-taught value investor but runs a concentrated portfolio of only ten stocks; his average annual return for the last decade is 24%."