'unexpectedly-stopped' originates from the combination of 'unexpectedly' and 'stopped', where 'unexpectedly' is derived from 'unexpected', meaning 'not anticipated', and 'stopped' from 'stop', meaning 'to cease movement'.

'unexpectedly' evolved from the Old English 'un-' meaning 'not' and 'expect' from Latin 'expectare', while 'stopped' comes from the Old English 'stoppian'.

Initially, 'unexpectedly' meant 'not foreseen', and 'stopped' meant 'ceased movement'. Together, they convey the idea of a sudden halt.