pest

In its biological sense, the word carries a strong connotation of invasion and destruction. It isn't just any animal; it is an organism that actively disrupts a human-managed system (like a garden or a warehouse). The focus is on the damage caused rather than the species itself. When applied to people, it shifts from 'destructive' to 'irritating'. It describes someone who persists in bothering others, often through pestering or clinginess. While it can be used harshly, it is frequently used with a touch of affection or exasperation when referring to children, making it less severe than words like "nuisance" or "menace".