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runaway

 
/ˈrʌn·əˌweɪ/ adj [not gradable] (not controlled)

Definition

being or seeming to be out of control, or happening suddenly and strongly: runaway health-care costs From the moment he launched the Boy Scout movement in 1908, it was a runaway success.
(Definition of runaway adj (not controlled) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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