believed or reputed to be the case
"The supposedly lost painting was recently discovered in an attic, though its authenticity remains unproven."
As a matter of supposition; in the beliefs or according to the claims of some people.
"The supposedly lost painting was finally rediscovered in an attic, though no one knows how it got there."
In plain English: Supposedly means something is believed to be true by most people, even though there isn't always proof that it actually happened.
"He is supposedly going to be late for the meeting again."
Usage: Use supposedly when reporting what others claim is true, often implying that you are not personally verifying those facts. It differs from actually by highlighting the gap between public belief and established reality.
Supposedly is formed by adding the suffix "-ly" to the word supposed. This construction simply indicates that something is believed or claimed to be true without necessarily being proven.