'suddenly-lost' is a compound word formed from 'suddenly' and 'lost'. 'Suddenly' originates from Middle English 'sodein', from Old French 'soudain', from Latin 'subitaneus', meaning 'unexpected'. 'Lost' comes from Old English 'losian', meaning 'to perish'.

'Suddenly' evolved from the Latin 'subitaneus' through Old French 'soudain', while 'lost' evolved from Old English 'losian'. The combination of these words into 'suddenly-lost' is a modern English construct.

Initially, 'suddenly' meant 'unexpectedly', and 'lost' meant 'to perish'. Together, they convey the idea of something unexpectedly missing.