'hazardousness' originates from English, specifically formed by combining the adjective 'hazardous' and the suffix '-ness' to denote a state or quality. 'Hazardous' itself derives from 'hazard.'

'hazard' came into Middle English from Old French 'hasard', which in turn traces back to Spanish 'azar' and Arabic 'az-zahr' meaning 'the die' (used in games of chance). From Middle English 'hazard' developed the adjective 'hazardous' (hazard + -ous), and modern English formed the noun 'hazardousness' by adding the suffix '-ness'.

Initially related to 'dice' or a game of chance (from Arabic), the term shifted to mean 'chance, risk' and later 'danger'; 'hazardousness' now means 'the quality of being dangerous'.