dad-sharp
As sharp as your dad’s knives after he forgot to sharpen them and used them to cut pizza and toast. It’s like dad-sharp: barely sharp enough to cut your mom’s hair, but not so sharp it’ll stab you.
I tried to cut my sandwich with dad-sharp knives and it felt like I was fighting a loaf of bread.
My dad used his knife to cut cheese and it looked like he was trying to murder the cheese.
I used dad-sharp knives to cut my brother’s hair and it looked like a war zone.