The CIA did a study on such "words of estimative probability" back in the 60's https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publication

The CIA did a study on such "words of estimative probability" back in the 60's https://www.cia.gov/library/center-for-the-study-of-intelligence/csi-publications/books-and-monographs/sherman-kent-and-the-board-of-national-estimates-collected-essays/6words.html https://www.cia.gov/library/center-for-the-study-of-intellig...