a hard material ( synonym found)
Definition of a hard material:

°Having no matter or substance.
"Because ghosts are immaterial, they can pass through walls."
°Irrelevant.
"Objection, Your Honour! The defendant's criminal record is immaterial to this case."
Definition of a hard material:

°Having no matter or substance.
"Because ghosts are immaterial, they can pass through walls."
°Irrelevant.
"Objection, Your Honour! The defendant's criminal record is immaterial to this case."
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