Synonyms of 'runaway'
1 easily won
a runaway success
2 out of control
The runaway car careered into a bench.
out of control
a runaway horse
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A deserter is someone who leaves their job in the armed forces without permission.
He was a deserter from the army.
If a job or action is easy, you can do it without difficulty or effort, because it is not complicated and causes no problems.
This is not an easy task.
Thesaurus for runaway from the Collins English Thesaurus
You use runaway to describe a situation in which something increases or develops very quickly and cannot be controlled.