The term ASTONISHED REACTION can be summarized by two crossword solutions: GASP (4 letters) and WOW (3 letters). GASP is an expression of surprise or shock, usually uttered with a sudden intake of breath. It is often used to express astonishment or admiration. WOW is an exclamation of surprise, admiration, or strong emotion. It is often used to express amazement or admiration at something unexpected or remarkable.