sickernessEtymologyFrom Middle English sikirnes, sikernesse, Old English sicornes (“certainty; secureness”), equivalent to sicker (“secure”) + -ness.sickerness means the state, condition, or quality of being certain; certainty; assurance. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounthe state, condition, or quality of being certain; certainty; assurance.security; safety; freedom from danger.“Lightly she leaped, as a wight forlore, / From her dull horse, in desperate distresse, / And to her feet betooke her doubtfull sickernesse.”