Rigid /(?)/

Rig·id

Rigid

a.
  1. Firm; stiff; unyielding; not pliant; not flexible.
    Upright beams innumerable Of rigid spears.
  2. Hence, not lax or indulgent; severe; inflexible; strict; as, a rigid father or master; rigid discipline; rigid criticism; a rigid sentence.
    The more rigid order of principles in religion and government.