unlearnt

例句：

1. 1. I've never unlearnt the basics of cooking.
   我从未学过烹饪的基本技巧。
2. 2. The unlearnt language is difficult to learn.
   这种未知的语言很难学习。
3. 3. She was unlearnt of the dangers of smoking.
   她不知道吸烟的危险。