You would call strong cardboard 'cardboard'. It doesn't matter how strong it is, the cardboard is still cardboard. Even if the cardboard is extremely stiff, it is still cardboard, and there is no special name for it.
a heavy,stiff paper used to make boxes and posters
That is the proper spelling of "cardboard" (the stiff brown corrugated paper material).
To allow the body to move around and not be stiff like a cardboard cut out.
Try cleaning with saddle soap and then a good leather conditioner
The zester should be soaked in soapy water to soften the food residue, then cleaned with a stiff brush, such as a tooth brush.
it means it can not move around muchSome definitions straight from my apple laptop:stiff |stif|adjective1 not easily bent or changed in shape; rigid : a stiff blackcollar | stiff cardboard.• not moving as freely as is usual or desirable; difficult to turn or operate : a stiff drawer | the faucet in the shower is a little stiff.• (of a person or part of the body) unable to move easily and without pain : he was stiff from sitting on the desk | a stiff back.• (of a person or their manner) not relaxed or friendly; constrained : she greeted him with stiff politeness.• viscous; thick : add wheat until the mixture is quite stiff.2 severe or strong : they face stiff fines and a possible jail sentence | a stiff increase in taxes.
it means it can not move around muchSome definitions straight from my apple laptop:stiff |stif|adjective1 not easily bent or changed in shape; rigid : a stiff blackcollar | stiff cardboard.• not moving as freely as is usual or desirable; difficult to turn or operate : a stiff drawer | the faucet in the shower is a little stiff.• (of a person or part of the body) unable to move easily and without pain : he was stiff from sitting on the desk | a stiff back.• (of a person or their manner) not relaxed or friendly; constrained : she greeted him with stiff politeness.• viscous; thick : add wheat until the mixture is quite stiff.2 severe or strong : they face stiff fines and a possible jail sentence | a stiff increase in taxes.
it means it can not move around muchSome definitions straight from my apple laptop:stiff |stif|adjective1 not easily bent or changed in shape; rigid : a stiff blackcollar | stiff cardboard.• not moving as freely as is usual or desirable; difficult to turn or operate : a stiff drawer | the faucet in the shower is a little stiff.• (of a person or part of the body) unable to move easily and without pain : he was stiff from sitting on the desk | a stiff back.• (of a person or their manner) not relaxed or friendly; constrained : she greeted him with stiff politeness.• viscous; thick : add wheat until the mixture is quite stiff.2 severe or strong : they face stiff fines and a possible jail sentence | a stiff increase in taxes.
To break in stiff hiking boots for maximum comfort on the trails, try wearing them around the house or on short walks to gradually soften the material. Use thick hiking socks to prevent blisters and consider using a boot stretcher to help with tight spots. Additionally, applying a leather conditioner can help soften the material and improve flexibility.
Cardstock is a very thick and stiff paper often used for crafting, printing business cards, invitations, or other paper products requiring a sturdy material. It is thicker and more durable than standard paper but still flexible enough for various applications.
It is called a pall, it is basically a stiff piece of cardboard covered in white linen and usually embroidered with a cross or some other religious symbol.