ˈawe-inˌspiring adjective
extremely impressive in a way that makes you feel great respect:
a truly awe-inspiring achievement

[TahlilGaran] Dictionary of Contemporary English ▲

impressive used about something that people admire because it is very good, large, important etc:
The cathedral is very impressive.
The drug has shown some impressive results.
dazzling extremely impressive – used especially when someone does something very well or looks very beautiful:
a dazzling performance
a dazzling smile
breathtaking extremely impressive – used especially about beautiful views, or the fast speed of something:
The views of the Rocky Mountains are simply breathtaking.
The economy is growing at a breathtaking pace.
spectacular very impressive and exciting to look at or watch:
a spectacular fireworks display
awe-inspiring so impressive that you feel great respect and admiration, or you feel rather frightened:
Michelangelo’s masterpiece is awe-inspiring.
The volcano was an awe-inspiring sight.
majestic [usually before noun] very impressive because of being big and beautiful:
the majestic mountain scenery
a majestic animal
imposing [usually before noun] written used about buildings and people that are large and impressive:
the imposing entrance hall
The bishop was an imposing figure.

[TahlilGaran] English Thesaurus ▲