This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. As a matter of supposition; in the beliefs or according to the claims of some people.

As may be supposed; by supposition; presumably.

ad. believed or reputed to be the case

"Beyond an intention to make something decadent for women—or "queens" as the "Q" in the name supposedly represents—Mr. Williams confessed why he designed his own adult dairy drink."

supposably   

purportedly