'fundamentalist-minded' originates from modern English, formed by combining the noun/adjective 'fundamentalist' and the adjective-forming/combinatory suffix '-minded' (from 'mind').

'fundamentalist' developed in the early 20th century from 'fundamentalism' (the movement named for certain 'fundamentals' of belief), where 'fundamental' comes from Latin 'fundamentum' via Old French; '-ist' is an agent/affiliation suffix. The element 'minded' comes from Old English 'gemynd' (mind, memory) which evolved into Middle English 'mind' and the adjective-forming use '-minded' (meaning 'having a mind or inclination toward'). These parts combined in modern English to form the compound 'fundamentalist-minded'.

Initially, 'fundamentalist' referred specifically to adherents of early 20th-century Protestant Fundamentalism; over time it broadened to describe strict, literal, or doctrinaire approaches in religion and other domains. Combining it with '-minded' yields the current meaning 'having a fundamentalist-oriented mindset.'