[adjective] - unable to be stopped or prevented from developingIt is hoped that the peace talks bring about some sort of resolution before the unstoppable momentum of war takes over.The band has enjoyed a seemingly unstoppable rise in popularity.Once she has decided on a particular course of action, she's like an unstoppable juggernaut.
UNSTOPPABLE
Meaning of UNSTOPPABLE in English
Cambridge English vocab. Кембриджский английский словарь. 2012