Used in informal settings among friends or in light-hearted conversations. My cousin is such a screwball, always playing pranks.
Pro Tip 2/3
Humor Tolerance
Although generally playful, be cautious as some might find it slightly offensive. Don't call someone a screwball unless you know they won't take it the wrong way.
Pro Tip 3/3
Not Professional
Avoid using 'screwball' in professional or formal contexts. It's too casual. Instead of 'screwball', use 'unconventional' in a business meeting.