from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Not flexible or pliant; stiff: synonym: stiff.
  • adjective Not moving or flexing.
  • adjective Not changing or adjusting to different conditions or problems.
  • adjective Scrupulously or severely maintained or performed; rigorous or harsh.
  • adjective Being an airship with a external frame made of rigid parts.

from The Century Dictionary.

  • 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 the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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