stiff or unyielding; not pliant or flexible; hard: a rigid strip of metal.
firmly fixed or set.
inflexible, strict, or severe: a rigid disciplinarian; rigid rules of social behavior.
exacting; thorough; rigorous: a rigid examination.
so as to meet precise standards; stringent: lenses ground to rigid specifications.
Mechanics. of, relating to, or noting a body in which the distance between any pair of points remains fixed under all forces; having infinite values for its shear modulus, bulk modulus, and Young's modulus.
- (of an airship or dirigible) having a form maintained by a stiff, unyielding structure contained within the envelope.
- pertaining to a helicopter rotor that is held fixedly at its root.
Origin of rigid
1530–40; < Latin rigidus, equivalent to rig(ēre) to be stiff, stiffen + -idus -id4
Synonyms for rigid
Antonyms for rigid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
not bending; physically inflexible or stiffa rigid piece of plastic
unbending; rigorously strict; severerigid rules
completely or excessivelythe lecture bored him rigid
Word Origin for rigid
C16: from Latin rigidus, from rigēre to be stiff
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
early 15c., from Latin rigidus "hard, stiff, rough, severe," from rigere "be stiff," from PIE *reig- "stretch (tight), bind tightly, make fast" (cf. Old Irish riag "torture," Middle High German ric "band, string"). Related: Rigidly.
Online Etymology Dictionary, © 2010 Douglas Harper