Definition of stupendous adjective from the Oxford Advanced Learner's Dictionary

 

stupendous

 adjective
adjective
BrE BrE//stjuːˈpendəs//
 
; NAmE NAmE//stuːˈpendəs//
 
(rather informal)
 
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extremely large or impressive, especially greater or better than you expect synonym staggering stupendous achievements stupendous costs Word Origin mid 16th cent.: from Latin stupendus ‘to be wondered at’ (gerundive of stupere) + -ous.
See the Oxford Advanced American Dictionary entry: stupendous