Flabbergastingly vs. Flabbergast
Flabbergastinglyadverb
Surprisingly, astonishingly or amazingly
Flabbergastverb
(transitive) To overwhelm with bewilderment; to amaze, confound, or stun, especially in a ludicrous manner.
Flabbergastnoun
(countable) An awkward person.
Flabbergastnoun
(uncountable) Overwhelming confusion, shock, or surprise.
Flabbergastverb
To astonish; to strike with wonder, esp. by extraordinary statements.
Flabbergastverb
overcome with amazement;
Flabbergastverb
surprise (someone) greatly; astonish
