IPA: //ʌnˈtjuːtəd//
KK: /ʌnˈtuːtərd/
Not having received formal education or training, often resulting in a lack of sophistication or refinement.
Despite being untutored, she had a natural talent for painting that impressed everyone.
Untutored → It is formed from "un-" (meaning not) and "tutored" (from Latin "tutor" meaning to guard or to teach). The word "untutored" means not having been taught or lacking formal instruction.
Think of someone who has not been 'taught' ('tutor') anything, which is what 'untutored' means.