confinement (noun) – a state of being imprisoned, incarcerated, or shut in
BREAKDOWN: CON- (with) + FIN- (end) + -MENT (state of)
— confined means closed, restricted, or not free to move
This word is built on the root FIN-, which means end, last, or limit.
Common FIN- words include confine, define, final, finance, fine, finish, and infinity.
More esoteric FIN- words include finery, financier, paraffin, and superfine.