Literal:
* Like that - This is the most direct translation.
Informal:
* So-so
* Meh
* Whatever
* It's okay
* Not bad
Formal:
* In this way
* Thus
Examples:
* "How did you do it?" "Comme ça." (Like that.)
* "Did you enjoy the movie?" "Comme ça." (So-so.)
* "I'm not sure what to do." "Just do it comme ça." (In this way.)
The best English translation will depend on the specific situation and the intended meaning.