Synonyms of 'disappearance'
2 flightDictionary, departure, desertion
his disappearance while out on bail
3 lossDictionary, losing, theft
Loss is the fact of no longer having something or having less of it than before.
Police are investigating the disappearance of confidential files.
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The first signs of economic decline became visible.
The high rate of desertion has added to the army's woes.
Thesaurus for disappearance from the Collins English Thesaurus
If you refer to someone's disappearance , you are referring to the fact that nobody knows where they have gone.