Antonyms for the word "most arthritic" include words such as flexible, mobile, nimble, agile, and supple. These words indicate a condition or state of being that is opposite to stiffness and joint pain associated with arthritis. Additionally, antonyms for this phrase can also include words such as vibrant, energetic, and spry, which suggest a vitality and agility that are lacking in people who suffer from arthritis. These antonyms are useful in communicating the opposite meanings of "most arthritic" and can be used to describe individuals who are healthy and active, as well as objects or environments that are free from limitations and restrictions that arise from arthritic conditions.