'agnostic' originates from Greek, specifically the word 'agnostos,' where 'a-' meant 'not' and 'gnostos' meant 'known.'

'agnostos' transformed into the English word 'agnostic' in the 19th century, coined by Thomas Huxley.

Initially, it meant 'unknown or unknowable,' but over time it evolved into its current meaning of 'one who believes that the existence of a deity is unknown or unknowable.'