'suddenly-completed' originates from the combination of 'suddenly' and 'completed'. 'Suddenly' comes from Middle English 'sodein', from Old French 'soudain', from Latin 'subitaneus', meaning 'unexpected'. 'Completed' comes from Latin 'completus', past participle of 'complere', meaning 'to fill up'.

'Suddenly' changed from the Old French word 'soudain' and eventually became the modern English word 'suddenly'. 'Completed' evolved from the Latin 'completus' through Middle English.

Initially, 'suddenly' meant 'unexpected', and 'completed' meant 'filled up'. Over time, 'suddenly-completed' evolved to mean 'finished abruptly'.