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"rigid" is also used as a crossword clue. If that's what you saw, the answer is often stiff (5 letters).
Definitions
incapable of or resistant to bending
Word origin
From Middle English rigide, from Latin rigidus (“stiff”), from rigeō (“to be stiff”). Compare rigor. Merged with Middle English rigged, rygged, rugged (“upright like a spine, rigid”, literally “ridged”), from ridge + -ed.
Used in a sentence
“A sunflower, four more, one bowed, and horses in the distance standing rigid and still as toys.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Not flexible”5 letters
02“Stiff”5 letters
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