What about suppose?
Suppose: to assume for the sake of argument; to think or hold as an opinion; to require logically.
Supposed (adj); SUPPOSEDLY (adv)
Why is it every other damned moron says SUPPOSEBLY?! WTF!! “Supposebly he went to the store.”
sorry. tension breaker, had to be done.[/quote]
actually supposedly and supposably are both words. as you said supposedly is the adverb of supposed:
“swivel’s supposedly bringin’ the beers tonight.”
likewise supposably is the adverb of supposable:
“supposably swivel goes out and picks up enough chicks for all of us.”
but you’re right, i suppose most times people should be sayin’ supposedly 'cause supposably there ain’t alot of times you’re supposed to talk about that which is capable of being supposed. eh ?