'unexpectedly-basic' is a compound word formed from 'unexpectedly' and 'basic'. 'Unexpectedly' originates from the Latin word 'exspectare', meaning 'to look out for', and 'basic' comes from the Greek word 'basis', meaning 'foundation'.

'Unexpectedly' evolved from the Middle English 'unexspected', and 'basic' from the Middle English 'basik', eventually forming the modern English compound 'unexpectedly-basic'.

Initially, 'unexpectedly' meant 'not expected', and 'basic' meant 'of or forming a base'. The compound 'unexpectedly-basic' retains these meanings, emphasizing the surprise in simplicity.