5 he could have thrown his servant into the street in the sure knowledge that it would be put down to robust good humour
unquestionable, indisputable, incontestable, irrefutable, incontrovertible, undeniable, indubitable, beyond question, beyond doubt; undoubted, absolute, categorical, true, certain, well grounded, well founded, proven, settled, decided; obvious, evident, plain, clear, conclusive, final, definite, unmistakable, manifest, patent
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sure, certain, convinced, positive, definite
These words are all used to describe a person who is confident that their belief is well founded and, in this sense, are all used after a verb such as be, become, or remain.Sure, certain, and convinced all have very similar meanings, but sure is the most common in this sense. They can all be followed by of ( one thing we were sure of: we couldn't go back), about ( are you absolutely certain about this?), or a clause, with or without that ( he was convinced that his theory was correct). Convinced is the word most typically used with of in this sense ( everyone seems very convinced of his guilt); sure of and certain of also mean ‘confident of receiving or doing something’ ( you are always sure of a welcome | he's not certain of his place in the Liverpool line-up).Positive is typically used in speech or reported speech, with no following construction ( ‘Are you sure she won't want to pursue the issue?’ ‘Positive.’). It can, however, be followed by a clause ( Columbus was positive that Japan lay just over the horizon).If someone is definite about something, they are not only confident that it is true but are also stating their belief very firmly ( ‘Not a chance.’ Jean was definite). Definite, in this sense, can be followed by a clause ( Sidney Knowles also saw the body and was quite definite that it was not Crabb).