from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not flexible or pliant; stiff.
  • adj. Not moving; fixed.
  • adj. Marked by a lack of flexibility; rigorous and exacting: "We have watered down a rigid training . . . until we now have an educational diet in many of our public high schools that nourishes neither the classes nor the masses” ( Agnes Meyer).
  • adj. Scrupulously maintained or performed: rigid discipline. See Synonyms at stiff.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Stiff, rather than flexible.
  • adj. Fixed, rather than moving.
  • adj. Rigorous and unbending.
  • adj. Uncompromising.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Firm; stiff; unyielding; not pliant; not flexible.
  • adj. Hence, not lax or indulgent; severe; inflexible; strict

from The Century Dictionary and Cyclopedia

  • Stiff; not pliant or easily bent; not plastic or easily molded; resisting any change of form when acted upon by force; hard.
  • Not easily driven back or thrust out of place; unyielding; firm.
  • Not easily wrought upon or affected; inflexible; hence, harsh; severe; rigorous; rigorously framed or executed: as, a rigid sentence; rigid criticism.
  • Strict in opinion, conduct, discipline, or observance; uncompromising; scrupulously exact or exacting: as, a rigid disciplinarian; a rigid Calvinist.
  • Stiff in outline or aspect; harsh; hard; rugged; without smoothness, softness, or delicacy of appearance.
  • Sharp; severe; bitter; cruel.
  • In dynamics: Absolutely incapable of being strained.
  • Resisting stresses.
  • Synonyms and Severe, Rigorous, etc. (see austere), inflexible, unbending, unyielding.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. incapable of compromise or flexibility
  • adj. fixed and unmoving
  • adj. designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
  • adj. incapable of adapting or changing to meet circumstances
  • adj. incapable of or resistant to bending


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English rigide, from Latin rigidus, from rigēre, to be stiff; see reig- in Indo-European roots.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin rigidus ("stiff"), from rigere ("to be stiff"), probably originally "to be straight"; compare rectus ("straight"), from regere ("to stretch"); see regent and right. Compare rigor.



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