If someone is untutored, they have not been formally trained to do something, although they may be quite skilled at it.
例句
This untutored mathematician had an obsession with numbers...这位非科班出身的数学家对数字特别痴迷。They had left school at fifteen and were quite untutored in writing.他们15岁就辍学了,几乎未接受过正式的写作训练。
英英词典释义
Adjective
1. lacking in schooling;
"untaught people whose verbal skills are grossly deficient""an untutored genius""uneducated children"