A frenzy is a state of wild, uncontrolled excitement or activity. When shoppers descend on a store during a huge sale, pushing and grabbing items off shelves, that chaotic scene is a frenzy. When sharks detect blood in the water and begin thrashing and biting in a violent rush, marine biologists call it a feeding frenzy.

The word suggests intense emotion combined with frantic action. During a frenzy, people or animals lose their normal calm and self-control. A crowd might work itself into a frenzy at a concert, screaming and jumping without thinking. A person in a frenzy isn't thinking clearly: they're caught up in powerful feelings that override their usual judgment.

You'll often see frenzy used to describe group behavior, where excitement spreads from person to person and builds on itself. A classroom might erupt into a frenzy when someone spots a mouse, with students jumping on chairs and shouting. The word captures that moment when orderly activity breaks down into wild chaos.

The adjective form is frenzied: “The frenzied pace of the holiday season left everyone exhausted.” When something happens in a frenzy, it happens in a rushed, agitated way that suggests panic or overwhelming excitement rather than calm, purposeful action.