Physically unyielding or stiff (5)
I believe the answer is:
rigid
(Other definitions for rigid that I've seen before include "Stiff, unmoving" , "not relaxing" , "Stiff, unbending" , "stern" , "strict" .)
I believe the answer is:
rigid
(Other definitions for rigid that I've seen before include "Stiff, unmoving" , "not relaxing" , "Stiff, unbending" , "stern" , "strict" .)