Putin also envisioned a future for war where drones, OSTENSIBLY controlled by artificial intelligence, would fight proxy wars between countries
link to the article
After the participants completed the scrambled-sentence task, they went to another laboratory to participate in what was PURPORTEDLY a second task
link to the book (170th page)
links to the explanations:
it says that purportedly is supposedly; ostensibly is seemingly or apparently
roger that, but
this source conveys some slightly different point in view of previous explanation
Seemingly: Use when an observable fact is contrary to the truth
Supposedly: Use when a fact is rumored to be true
Apparently: Use when the truth of a fact is observable, if one looks
As for me, supposedly and apparently are opposite to each other
This book ostensibly provides the reader with all the information needed to write good prose.
Here the speaker is implying that some other information — the blurb on the book jacket, a review in a newspaper perhaps — has suggested that the book contains the information in question, but that the speaker makes no guarantees on that point and may even be setting up a rebuttal to that contention, following the first sentence with something like "But I found it an utter waste of time."
Oxford dictionary has the word 'purportedly' for 'ostensibly' as a synonym
I wonder what is the difference between 'ostensibly' and 'purportedly'