unable to bend or be forced out of shape; strict and inflexible
Latin rigidus 'stiff, hard', from rigere 'to be stiff'
Rigid comes from the Latin 'rigere' meaning 'to be stiff' - the same root that gives us 'rigor mortis' (the stiffness of death). In engineering, rigidity can be a strength, but in thinking, it's often a weakness!
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