What is another word for most fastening?
Pronunciation: [mˈə͡ʊst fˈasənɪŋ] (IPA) 
The word "fastening" refers to something that holds or secures two or more objects together. To describe something as the "most fastening," we can use a variety of synonyms such as secure, tight, sturdy, firm, strong, reliable, dependable, or steadfast. These words all convey the idea of something being tightly bound or held together, creating a sense of safety and stability. Other related terms include durable, long-lasting, and unbreakable, which suggest that the fastening is capable of enduring wear and tear over time. By using these synonyms, we can more precisely convey the idea of something being strongly bound and secured.
