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comparative more indubitably, superlative most indubitably
In a manner that leaves no possibility of doubt; undoubtedly. quotations examples
Now his first suspicion was indubitably confirmed.
1871, Thomas Hardy, chapter 18, in Desperate Remedies
The world is indubitably one if you look at it in one way, but as indubitably is it many, if you look at it in another. It is both one and many—let us adopt a sort of pluralistic monism.
1907, William James, Pragmatism: A New Name for Some Old Ways of Thinking
They were all indubitably, aggressively alive! Everybody was alive once more!
1913, Arthur Conan Doyle, “(please specify the page)”, in The Poison Belt […], London; New York, N.Y.: Hodder and Stoughton