Etymology
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rigid (adj.)

"stiff, unyielding, inflexible, firm, not easily bent," early 15c., from Latin rigidus "hard, stiff, rough, severe," from rigēre "be stiff" (from PIE root *reig- "stretch; be stretched; be stiff"). Related: Rigidly. As a verb, "to make rigid," rigidize is attested by 1944 in U.S. military and commercial use in reference to metals; earlier was rigidify (1842), rigidification.

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Definitions of rigid

rigid (adj.)
incapable of or resistant to bending;
a table made of rigid plastic
a rigid strip of metal
Synonyms: stiff
rigid (adj.)
incapable of compromise or flexibility;
Synonyms: strict
rigid (adj.)
incapable of adapting or changing to meet circumstances;
a rigid disciplinarian
Synonyms: inflexible / unbending
rigid (adj.)
designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure;
rigid (adj.)
fixed and unmoving; "his bearded face already has a set hollow look"- Connor Cruise O'Brien;
a face rigid with pain
Synonyms: fixed / set
From wordnet.princeton.edu