The term 'leave slack-jawed' can be summarized by four crossword solutions: ASTOUND (7 letters), AWE (3 letters), STUN (4 letters), and AMAZE (5 letters). All of these words refer to the act of being overwhelmed with surprise or admiration, often to the point of being speechless. ASTOUND is the most intense of the four words, referring to a feeling of great shock or amazement. AWE is a less intense feeling of admiration or respect, while STUN and AMAZE refer to feelings of surprise and wonder.