STUPEFYINGLY
Scrabble letter values: S1T1U1P3E1F4Y4I1N1G2L1Y4 = 24
Definition
STUPEFYINGLY is the adverb form of STUPEFYING.
adjective STUPEFYING: so surprisingly impressive as to stun or overwhelm.
Synonyms of STUPEFYING: astonishing, astounding, staggering