The term 'IMPRESSIVELY HIGH' can be described by two crossword solutions: LOFTY (5 letters) and TOWERING (8 letters). LOFTY is an adjective that means very high or LOFTY in rank, position, or status. It is often used to describe something that is of a high quality or standard. TOWERING is an adjective that means very tall or high, usually referring to a structure or building. It is often used to describe something that is very impressive or grand.