rigid (Adjective) — Incapable of or resistant to bending. ex. "a rigid strip of metal" ex. "a table made of rigid plastic"
rigid (Adjective) — Incapable of compromise or flexibility.
rigid (Adjective) — Incapable of adapting or changing to meet circumstances. ex. "a rigid disciplinarian"
rigid (Adjective) — (aeronautics) designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure.
rigid (Adjective) — Unchanging and unmoving. ex. "a face rigid with pain"