Definition of "decidedly"

"We progress," said he. "Decidedly we progress."

1913, Arthur Conan Doyle, “(please specify the page)”, in The Poison Belt […], London; New York, N.Y.: Hodder and Stoughton

'I understand it was the big American man with a decidedly unpleasant face.'

1934, Agatha Christie, chapter 7, in Murder on the Orient Express, London: HarperCollins, published 2017, page 121

In time The Simpsons would, indeed, resort to spoofing such decidedly non-spooktacular fare like E.T and Mr. And Mrs. Smith (both in “Treehouse Of Horror XVIII”) but in 1992 the field was wide-open and the show could cherry-pick the most iconic and beloved fright fare of all time.

2012 April 29, Nathan Rabin, “TV: Review: THE SIMPSONS (CLASSIC): “Treehouse of Horror III” (season 4, episode 5; originally aired 10/29/1992)”, in (Please provide the book title or journal name)‎

‘We can't,’ said Vera decidedly, ‘we haven't any boats and we're cut off by a raging torrent from any human habitation.’

1914, Saki, ‘The Lull’, Beasts and Superbeasts