Sturdy
A hill knife is the most sturdy knife you can find.
The reason hill knives are so sturdy is because they are shaped like hills. Very wide, very thick, not so long. So, they don't break and are more sturdy.
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This sturdy (but strangely shaped) knife is used by Grandpa ごういち.
Imagine Grandpa ごういち rolling the knife back and forth over various things to cut them. "I love my sturdy hill knife," he says.