< Latin lapidārius, < lapid-, lapis stone.
1. Concerned with stones. rare.
2.a. Of an inscription, etc.: Engraved on stone, esp. monumental stones.
b. Of style, etc.: Characteristic of or suitable for monumental inscriptions.(OED)
"The boy is staring at you with lapidary intensity."
- Junot Díaz, "The Cheater's Guide to Love", New Yorker 23 July 2012