2- To be stiff with someone is to be reserved and withdrawn, probably through shyness but possibly through anger.
A stiff exterior would suggest a judgmental attitude.
3- At certain stages of spiritual development, discipline can appear as stiffness. [1]
A circumstantial dream that comes from sleeping in an uncomfortable position.
Arrogant, strict, and uncompromising attitudes exhibited by yourself or others.
Because stiffness impedes your ability to move, this can be an alternative type of obstacle dream. [2]
(2) It may mean there is some emotional blockage in you.