'uncurved' originates from the Old English prefix 'un-' combined with 'curved', which ultimately comes from Latin 'curvus', where 'un-' meant 'not' and 'curvus' meant 'bent'.

'uncurved' was formed in modern English by attaching the negative prefix 'un-' to 'curved' (itself from Old French/Latin 'curvus'), evolving into the compound adjective 'uncurved'.

Initially, the components meant 'not' + 'bent', and over time the combined adjective has retained the meaning 'not bent/straight'.