'Rigid' definitions:

Definition of 'rigid'

(from WordNet)
adjective
Incapable of or resistant to bending; "a rigid strip of metal"; "a table made of rigid plastic"; "a palace guardsman stiff as a poker"; "stiff hair"; "a stiff neck" [syn: rigid, stiff]
adjective
Incapable of compromise or flexibility [syn: rigid, strict]
adjective
Incapable of adapting or changing to meet circumstances; "a rigid disciplinarian"; "an inflexible law"; "an unbending will to dominate" [syn: inflexible, rigid, unbending]
adjective
Designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure [ant: nonrigid]
adjective
Fixed and unmoving; "with eyes set in a fixed glassy stare"; "his bearded face already has a set hollow look"- Connor Cruise O'Brien; "a face rigid with pain" [syn: fixed, set, rigid]

Definition of 'Rigid'

From: GCIDE
  • 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. [1913 Webster]
  • Upright beams innumerable Of rigid spears. --Milton. [1913 Webster]
  • 2. Hence, not lax or indulgent; severe; inflexible; strict; as, a rigid father or master; rigid discipline; rigid criticism; a rigid sentence. [1913 Webster]
  • The more rigid order of principles in religion and government. --Hawthorne. [1913 Webster]
  • Syn: Stiff; unpliant; inflexible; unyielding; strict; exact; severe; austere; stern; rigorous; unmitigated. [1913 Webster]

Synonyms of 'rigid'

From: Moby Thesaurus