superfirm

adjective
su·​per·​firm | \ ˌsü-pər-ˈfərm How to pronounce superfirm (audio) \

Definition of superfirm

: extremely firm superfirm mattresses

First Known Use of superfirm

1928, in the meaning defined above

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The first known use of superfirm was in 1928

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incapable of being surmounted or overcome

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