in BRIT, also use 英国英语亦用 unlearnt
1.
VERB
设法忘记（或忽略）；抛掉（以前的错误想法、坏习惯等） If you unlearn something that you have learned, you try to forget it or ignore it, often because it is wrong or it is having a bad influence on you.
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They learn new roles and unlearn old ones...
他们学习新的角色，抛却旧的角色。
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Before you know it, you will have unlearned the debt habit.
很快你就会摒弃欠债的习惯。
- Verb
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1. try to forget; put out of one's memory or knowledge
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2. discard something previously learnt, like an old habit
