This is the 933rd most frequent Afrikaans word.
slim
Intelligent; clever.
Here 'slim' means 'smart' or 'intelligent', describing someone's intellectual capability.
Sy is baie slim.
She is very smart.
In this context, 'slim' refers to being astute or showing creative or practical thinking.
Dit is 'n slim plan.
That is a clever plan.
Here, 'slim' suggests being wise or aware in a practical sense.