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“flinty” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

flinty
siliceus: calculosus (general term for stony; of soil, etc.). Flinty soil, *terra silicea; glarea (sand of a flinty nature): to lay flints upon a road, viam glarea substruere.
Hard of heart; Vid: FLINT.

Quick answer

What is the Latin word for flinty?
The usual Latin words for “flinty” are siliceus, calculōsus, glārea. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.