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"rigidity" is also used as a crossword clue. If that's what you saw, the answer is often stiffness (9 letters).
Definitions
the quality of being rigid and rigorously severe
Word origin
From rigid + -ity, from Latin rigiditas.
Used in a sentence
“moral rigidity”
“The metal’s rigidity made it hard to bend.”
“She disliked the rigidity of the rules.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Inflexible stiffness”8 letters
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