To limit movement, to keep within a boundary
Confine
The limit
Confines
Having boundaries, limited, not permanent
Finite
Sense of the end; nothing more can happen
Finality
Skill, polish, delicacy
Finesse
Immeasurably small, can't calculate how small
Infinitesimal
For sure, without a doubt
Definite
To reduce to a pure state
Refine
The close or end of something, a really big finish
Finale
Have lots of muscles
Muscular
Relating to the Middle Ages
Medieval
A band of tissue in a human or animal body
Muscle