rigorousnessEtymologyFrom Middle English rigoresnes, rigoresnesse, rigorousenes, equivalent to rigorous + -ness.rigorousness means the property of being rigorous, strictness. Lexicurio rates it Rare gem — a strength score of 76 out of 100.nounThe property of being rigorous, strictness.“Not the first nor the best and certainly not the most famous dictionary of the English language, Swansby’s has always been a poor shadow of its competitors as a work of reference – from the first printed edition in 1930 to today it has nowhere near the success nor rigorousness of Britannica and the Oxford English Dictionary.”