Apocryphally

Isaac Newton apocryphally discovered his second law – the one about gravity – after an apple fell on his head.

"And are you an artist, too?" inquired Bunson's companion, prepared to let a little surplus enthusiasm loose on the MacQuibble. "MacQuibble's an impressionist," remarked Cripps a trifle apocryphally. "I'm nothing of the sort," exclaimed the MacQuibble, hurling down the gage of battle at once.