rock-ribbed

adjective
\ ˈräk-ˈribd How to pronounce rock-ribbed (audio) \

Definition of rock-ribbed

2 : firm and inflexible in doctrine or integrity a rock-ribbed conservative community— John Hale

First Known Use of rock-ribbed

1776, in the meaning defined at sense 1

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The first known use of rock-ribbed was in 1776

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