Wonderfully means extremely well or pleasingly. Wonderfully written, sleep wonderfully, wonderfully odd.
It intensifies as much as it praises, so wonderfully odd means very odd rather than pleasantly so — the wonder in it is now nearly all gone. It once meant in a way that causes wonder, which is why old texts use it about terrible things too.
1adverbwonderfullyExtremely well or pleasingly.
“The children behaved wonderfully at the wedding and even danced with their grandparents.”
wonderfully is a degree.
Also accepted in games: beautifully
Wonderful plus -ly. Wonder is Old English wundor, something astonishing, of unknown origin.
Middle English
wonderfully
English, today
wonderfully
From Middle English wonderfully, wunderfullie, wonderfulliche, equivalent to wonderful + -ly.
Etymology from Wiktionary, CC BY-SA