1) Amazing 2) Awe-inspiring 3) Awesome 4) Awful 5) Blowing away 6) Bowling over 7) Causing wonder in 8) Dumbfounding 9) Filling with wonder 10) Impressing 11) Impressive 12) Inspiring with reverence 13) Knocking for a loop 14) Knocking out 15) Knocking the socks off of 16) Leaving dumbstruck 17) Leaving speechless 1) Awesome 2) Impressive 
• (adv.) On the wing; flying; fluttering. • (p. pr. & vb. n.) of Awe
A·wing' adverb [ Prefix a- + wing .] On the wing; flying; fluttering. Wallace.