Fixed
Part of speech: verb
Definition: To pierce; now generally replaced by transfix.
Part of speech: adjective
Definition: Not changing, not able to be changed, staying the same. Stationary. Chemically stable. Supplied with what one needs.
Example sentence: Most economic fallacies derive from the tendency to assume that there is a fixed pie, that one party can gain only at the expense of another.
Rigid
Part of speech: adjective
Definition: Stiff, rather than flexible.Fixed, rather than moving.Rigorous and unbending.Uncompromising.
Example sentence: The rigid cause themselves to be broken; the pliable cause themselves to be bound.