melodramatic
Acting overly emotional or dramatic about small problems.
Melodramatic means exaggerating emotions or reactions way beyond what a situation actually calls for. When someone is being melodramatic, they treat a small problem like a massive catastrophe, complete with gasping, wailing, or declaring that everything is ruined.
Picture a student who drops their pencil and throws their hands up, crying, “This is the worst day of my entire life!” That's melodramatic. Or imagine someone who doesn't get picked first for kickball and acts like they've been deeply betrayed, sighing heavily and claiming nobody understands their suffering. The emotion might be real, but it's blown up to ten times its natural size.
The word comes from melodrama, a style of theater where villains twirl their mustaches, heroes are impossibly noble, and characters express everything in the most extreme way possible. Melodramas were entertaining precisely because they were so over-the-top.
Being melodramatic occasionally is normal, especially when you're tired or disappointed. But someone who's constantly melodramatic can exhaust the people around them because every minor setback becomes a theatrical production.