The term 'IMPRESS GREATLY' can be summarized by three crossword solutions: WOW (3 letters), DAZZLE (6 letters), and AWE (3 letters). WOW is an expression of surprise or admiration, often used to express strong feelings of approval. DAZZLE is to amaze or astound someone with something extraordinary. AWE is a feeling of reverential respect mixed with fear or wonder. All three words are used to describe the feeling of being deeply impressed by something.