firmerside
nounUK /ˈfɜːməsaɪd/
US /ˈfɜːrmərsaɪd/
The firmerside is the stronger, harder part of something.
The firmerside of the pillow stayed cool all night.
OTHER MEANINGS
2. The side of a place or object that is more solid and steady.
We walked along the firmerside of the path where the ground was dry.
3. A person's more serious or determined manner.
When it came to homework, she showed her firmerside.
4. The part of a material that holds its shape best.
Press the clay on its firmerside so it does not bend.