unaufhaltsam
unstoppable
Describes a process or movement that cannot be halted or stopped in its course.
Der technische Fortschritt scheint unaufhaltsam zu sein.
Technological progress seems to be unstoppable.

unstoppable
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unstoppable
Describes a process or movement that cannot be halted or stopped in its course.
Der technische Fortschritt scheint unaufhaltsam zu sein.
Technological progress seems to be unstoppable.

The word can be easily broken down: the prefix 'un-' means 'not', 'aufhalten' means 'to stop', and the ending '-sam' turns it into an adjective. So 'unaufhaltsam' (unstoppable) literally means 'not able to be stopped'.
Die Welle rollte unaufhaltsam auf die Küste zu.
The wave rolled unstoppably toward the coast.
This adjective is often used to describe large, abstract processes or powerful forces of nature. Common combinations are 'der unaufhaltsame Fortschritt' (unstoppable progress), 'der unaufhaltsame Wandel' (unstoppable change), or 'eine unaufhaltsame Lawine' (an unstoppable avalanche).
Der unaufhaltsame Aufstieg der künstlichen Intelligenz verändert unsere Welt.
The unstoppable rise of artificial intelligence is changing our world.
'Unaufhaltsam' (unstoppable / unstoppably) can also be used as an adverb to describe how an action happens. In this case, it is not declined and usually stands with the verb.
Die Zeit vergeht unaufhaltsam.
Time passes unstoppably.
inevitable
'zwangsläufig' and 'unaufhaltsam' both describe something that cannot simply be stopped. The difference is in the perspective. 'zwangsläufig' fits when something arises as a necessary consequence of a situation. 'unaufhaltsam' fits more with a process or movement that keeps going and cannot be slowed down. So 'zwangsläufig' explains more of the why, while 'unaufhaltsam' describes more of the course or progression.

Das Wasser stieg nach dem starken Regen unaufhaltsam weiter.
After the heavy rain, the water kept rising unstoppably.
Nach so vielen Fehlern führt die Entscheidung zwangsläufig zu Problemen.
After so many mistakes, the decision inevitably leads to problems.