We have all been warned about them. They’re called “modifiers” and are also known as “qualifiers.” William Strunk and E.B. White put it bluntly in their time-honored writing guide The Elements of Style when they called them “the leeches that infest the pond of prose, sucking the blood of words.”
Modifiers clutter and sap the energy from all types of writing. This video from MikeConsol.com lists examples of commonly overused modifiers, as well as examples, starting with a brief piece of writing with unnecessary modifiers, followed by that same piece of writing stripped of those modifiers. The contrast is striking.