it is supposedly
Supposedly is an adverb.
The cavemen supposedly rode the dinosaurs.
They supposedly moved from Denali, Alaska
There is no such word as supposively : the word is supposedly (ostensibly).
We were going to go to the movies, but supposedly there was a power outage.
Sindbad the Sailor was supposedly born in Sohar, Oman.
Cantarella is supposedly made from insects, specificlly beetles. From beetles a form of arsenic supposedly can be made and that's what makes Cantarella poisonous.
no
Supposedly she has the flu so she won't be in to work today.
The only one of the three that is an actual word is "supposedly" (allegedly).
Tecumseh Tecumseh supposedly predicted earthquakes and his own death.
Supposedly, people don't strive to make a difference because they don't believe that they can.