Akinetic-rigid HD is a term used to describe a specific type of Huntington's disease (HD) that causes a stiffening of the limbs and an inability to initiate movement. There are several synonyms for this term that can help describe the condition more accurately. Some of these synonyms include "stiff HD," "rigid HD," and "bradykinetic HD." Each of these terms highlights a different aspect of the condition, such as the stiffness of the muscles, the rigid posturing of the body, or the slowness of movement. It's important to use these synonyms when discussing HD with others to ensure clear communication and understanding of the condition.