Wiktionary
unstoppably
adv. In an unstoppable manner.
Usage examples of "unstoppably".
All turned about in time to see Cathy close the last few yards, in time for George to brace himself before she flung herself into his arms, legs enwrapping his hips, arms around his neck, mouth on his, tongues advancing unstoppably.
Golgotha, in towns and cities and starports, the rebels moved unstoppably forward, driving back the Imperial forces on all fronts.