The term HIGH-ENERGY can be described by two crossword solutions: PEP (3 letters) and DYNAMIC (7 letters). PEP is an acronym for Positive Energy and Power, which is a term used to describe a person or situation that is full of enthusiasm and vigor. DYNAMIC is an adjective that means having or showing energy and enthusiasm. Together, these two words accurately describe the term HIGH-ENERGY, which is often used to refer to someone or something that is full of energy and enthusiasm.