'inconstant' originates from Latin, specifically the word 'inconstans', where 'in-' meant 'not' and 'constans' meant 'standing firm'.

'inconstans' transformed into the Old French word 'inconstant', and eventually became the modern English word 'inconstant'.

Initially, it meant 'not standing firm', but over time it evolved into its current meaning of 'frequently changing'.