'randomly-decided' originates from the combination of 'randomly' and 'decided', where 'randomly' comes from 'random', meaning 'without a definite aim, direction, rule, or method', and 'decided' is the past participle of 'decide', meaning 'to make a choice or judgment'.

'randomly' evolved from the Middle English word 'randoun', and 'decided' from the Old French 'decider', which eventually became the modern English word 'decide'.

Initially, 'randomly' meant 'running at great speed', but over time it evolved into its current meaning of 'without a definite aim or method'.