rigid

adjective

rig·​id ˈri-jəd 

1

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

• strict
• rigorous

Choose the Right Synonym for rigid

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

synonyms see in addition stiff

Examples of rigid in a Sentence

The patient's legs were rigid.

He is a rigid disciplinarian.

Recent Examples on the Web

Unlike rigid anomaly detection models, LLMs have the capability of identifying unknown threats and can reduce false positives significantly. —Karan Alang, Forbes.com, 2 July 2025

The wall, which was built in the late 1990s and is 2,278 feet long, undulates instead of forming a rigid line. —Jennie Rothenberg Gritz, Smithsonian Magazine, 1 July 2025

Agencies can draw from underground reserves as needed without the rigid limitations of surface systems. —Matthew Kayser, USA Today, 30 June 2025

Once a nimble leader who used political and economic maneuvering to secure his regime’s survival, the aging Khamenei now governs an eroding and rigid state. —Mostafa Salem, CNN Money, 30 June 2025

Word History

Etymology

Middle English rigide, from Latin rigidus, from rigēre to be stiff

First Known Use

15th century, in the meaning defined at sense 1a

Rhymes for rigid

• frigid

Kids Definition

rigid

adjective

rig·​id ˈrij-əd 

1

: not flexible : stiff, hard

2

a

: very fixed in one's opinion or habits : unyielding

b

: carefully observed : scrupulous

follows a rigid exercise program

3

: exact and accurate in procedure

rigidity

rə-ˈjid-ət-ē

noun

rigidly

ˈrij-əd-lē

adverb

rigidness noun

Etymology

from Latin rigidus, "rigid," from rigēre "to be stiff" — related to rigor mortis

Medical Definition

rigid

adjective

rig·​id ˈrij-əd 

: deficient in or devoid of flexibility : characterized by stiffness

rigid muscles