Allegedly means as claimed but not yet proven. Allegedly stole, allegedly involved, he allegedly said.
It is the single most important word in court reporting, because printing an accusation as fact before a verdict is contempt and defamation both. It is also used sarcastically, and Have I Got News For You made a comic institution of saying it after any risky claim. Note allege, allegation; and that alleged and allegedly are placed carefully — the alleged offence, not the alleged man.
1adverballegedlyAs claimed but not yet proven.
“The man allegedly stole cash from the shop where he worked.”
allegedly is a hedge in reporting.
Also accepted in games: supposedly
From alleged + -ly.
Etymology from Wiktionary, CC BY-SA