"إضمحل" - Translation from Arabic to English

The ones we didn't kill just wasted away.
ومن لم نقتله منهم فقط إضمحل و مات

It can be subtle, handed down from generation to generation.
... قد يكون غير ملحوظ و إضمحل من جيل لآخر

and everything else was just like fading out.
وكل شيء بعدها إضمحل