Etymology: Middle English rigide, from Latin rigidus, from rigēre to be stiff
Date: 15th century
a. deficient in or devoid of flexibility <rigid price controls> <a rigid bar of metal> b. appearing stiff and unyielding <his face rigid with pain> 2. a. inflexibly set in opinion b. strictly observed <adheres to a rigid schedule> 3. firmly inflexible rather than lax or indulgent <a rigid disciplinarian> 4. precise and accurate in procedure <rigid control of the manufacturing process> 5. of an airship having the outer shape maintained by a fixed framework • rigidly adverb • rigidness noun Synonyms: rigid, rigorous, strict, stringent mean extremely severe or stern. rigid implies uncompromising inflexibility <rigid rules of conduct>. rigorous implies the imposition of hardship and difficulty <the rigorous training of recruits>. strict emphasizes undeviating conformity to rules, standards, or requirements <strict enforcement of the law>. stringent suggests severe, tight restriction or limitation <stringent standards of admission>. Synonym: see in addition stiff.
New Collegiate Dictionary. 2001.