Is mean a synonym of dastard?

No, "mean" and "dastard" are not synonyms. While they both describe negative qualities, they have distinct meanings.

Mean: This describes someone who is unkind, selfish, and often enjoys causing others pain.

Dastard: This describes someone who is cowardly and cruel, especially in a treacherous or cowardly way.

Here's an example:

* Mean: A mean child might steal another child's toys.

* Dastard: A dastardly act could be poisoning someone's food.

While someone could be both mean and dastardly, the terms are not interchangeable.