wondrous

adjectives

extraordinarily good or great ; used especially as intensifiers
"a fantastic trip to the Orient"; "the film was fantastic!"; "a howling success"; "a marvelous collection of rare books"; "had a rattling conversation about politics"; "a tremendous achievement"
is derived from

adverbs

(used as an intensifier) extremely well
"her voice is superbly disciplined"; "the colors changed wondrously slowly"