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Definitions of rigid:

adjective:   incapable of compromise or flexibility
adjective:   incapable of or resistant to bending
Example: "A rigid strip of metal"

adjective:   designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
adjective:   incapable of adapting or changing to meet circumstances
Example: "A rigid disciplinarian"

adjective:   fixed and unmoving
Example: "A face rigid with pain"

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Alternative Terms
stiff inelastic inflexible unbending unyielding flexible-rigid immutable inalterable invariable ironclad unalterable unchangeable adamant brassbound die-hard grim implacable incompliant inexorable intransigent iron obdurate relentless remorseless stubborn unbendable uncompliant uncompromising unrelenting resist-yield demanding exacting hard harsh severe stern strict tough easy-hard mathematics harmonic-function holomorphic-function schwarz-s-lemma fundamental-theorem-of-algebra polynomial infinity basis-linear-algebra mostow-rigidity-theorem well-order monotonic-function automorphism isomorphism euclidean-group euclidean-space-2 isometry planetmath rigid-shopping rigid-gift-box rigid-r7000 moment-connection rigid-body-mechanics malleable springy subrigid jacket statics rigidulous limber supple jointless overrigid rigidly lychniscosa

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