harm
The French word 'mal' can be used to describe harm or evil. It is often used in conjunction with other words to form phrases such as 'faire du mal' (to do harm) or 'avoir de mauvaises intentions' (to have harmful intentions).
It's bad to lie.
In this sentence, 'mal' is used to express a moral judgement about the action of lying. It declares lying to be 'mal' (bad).
He feels bad after eating too much.
In this example, 'mal' is used to describe the feeling of discomfort or uneasiness. The subject 'Il' is feeling 'mal' (bad) after overeating.
She misunderstood the question.
In this phrase, 'mal' is used in conjunction with 'compris' to indicate a misunderstanding. It suggests that 'Elle' (She) comprehended the question 'mal' (poorly or incorrectly).