Rigid \Rig"id\, a. [L. rigidus, fr. rigere to be stiff or numb: cf. F. rigide. Cf. Rigor. ]

1. Firm; stiff; unyielding; not pliant; not flexible.

Upright beams innumerable Of rigid spears. --Milton.

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. --Hawthorne.

Syn: Stiff; unpliant; inflexible; unyielding; strict; exact; severe; austere; stern; rigorous; unmitigated.

Source: Webster's Revised Unabridged Dictionary (1913)