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Meaning:
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stiff; that cannot be bent; firm; strict; not changing

stiff, strict, severe

adamant austere definite exact fixed hard-line harsh inflexible intransigent rigorous solid stern stringent uncompromising unyielding adamantine bullheaded changeless chiseled dead set determined firm hard incompliant inelastic inexorable invariable locked in obdurate set set in stone single-minded static strait-laced tough nut to crack unalterable unbending unbreakable unchanging undeviating unmoving unpermissive unrelenting
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Cases of word usage

1) a large rigid container, usually with a lid (bin)

2) (to cause something) to become hard like bone; change into bone; (to cause a person) to become rigid in one's opinions (ossify)

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RIGID as in Wikipedia