Extremely great, stupendous (10)
I believe the answer is:
monumental
(Other definitions for monumental that I've seen before include "Great in importance" , "Large and important" , "Enormous" , "Massive and lasting" , "Stupendous" .)
I believe the answer is:
monumental
(Other definitions for monumental that I've seen before include "Great in importance" , "Large and important" , "Enormous" , "Massive and lasting" , "Stupendous" .)