Instead of "wow," use more specific and expressive words to convey your reaction. Here are some alternatives based on the context:
- For amazement: Astounding, Incredible, Remarkable, Unbelievable, Mind-blowing
- For admiration: Impressive, Brilliant, Exceptional, Outstanding, Phenomenal
- For surprise: Wowzers, Holy moly, Goodness gracious, Oh my goodness, I can't believe it
- For delight: Fantastic, Wonderful, Splendid, Delightful, Lovely
Remember to tailor your response to the situation and the person you are talking to.