stiffness in WordNet English dictionary

1. the inelegance of someone stiff and unrelaxed (as by embarrassment)
   awkwardness  clumsiness  gracelessness  stiffness 
   
2. excessive sternness
   "severity of character"; "the harshness of his punishment was inhuman"; "the rigors of boot camp"
   severity  severeness  harshness  rigor  rigour  rigorousness  rigourousness  inclemency  hardness  stiffness 
   
3. the physical property of being inflexible and hard to bend
   stiffness 
   
4. the property of moving with pain or difficulty
   "he awoke with a painful stiffness in his neck"
   stiffness 
   
5. firm resoluteness in purpose or opinion or action
   "a charming host without any touch of stiffness or pomposity"
   stiffness