All bearings and bushings have a basic stiffness. When you apply load on the shaft the shaft will move, and so the stiffnes can be calculated from the ratio of the applied for…ce to the absolute value of movement. (MORE)
it means it can not move around much.
Some definitions straight from my apple laptop: stiff |stif|adjective1 not easily bent or changed in shape; rigid : a stiff blackcol…lar | stiff cardboard. â¢ 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. â¢ (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. â¢ (of a person or their manner) not relaxed or friendly; constrained : she greeted him with stiff politeness. â¢ 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. (MORE)
Cardiac amyloidosis or "stiff heart syndrome" is a disorder that iscaused by abnormal protein deposits in the heart tissue, making itdifficult for the heart to function proper…ly. Symptoms includeexcessive urination, fatigue, shortness of breath, swelling of theabdomen and heart palpitations. (MORE)