Inevitable (adjective) UK /ɪˈnev.ɪ.tə.bəl/ US /ˌɪnˈev.ə.t̬ə.bəl/
Certain to happen and unable to be avoided or prevented.
The accident was the inevitable consequence/result/outcome of carelessness.
Eventually the inevitable happened and he had a heart attack.
When you’re working such long hours, it’s inevitable that your marriage will start to suffer.
Synonyms = ineluctable, inescapable, unavoidable
“Inevitability” is the noun form and “inevitably” is the adverb form.