This is the place to post questions and discussions on usage and style. The members of the Wordwizard Clubhouse will also often be able to help you to formulate that difficult letter.
It wouldn't necessarily be wrong. However, the term badass implies more than an ability to handle pressure. It suggests that the person being described that way is physically and/or mentally tough, uncompromising, intimidating, not afraid of breaking rules or engaging in physical violence, or any combination of those qualities (depending on the context).ACCESS_POST_ACTIONS