1. comparative form of flint; more resembling flint in hardness, color, or texture
Usage: literal sense referring to the mineral flint or flint-like materials
2. comparative form of flint; more stern, cold, or unyielding in character or expression
Usage: figurative sense describing personality or demeanor

Examples

• The flintier rocks in the riverbed were difficult to break apart.
• Her expression grew flintier as she listened to his excuses.
• The soil became flintier and more barren as they traveled inland.
• He had a flintier demeanor than his more easygoing brother.
• The flintier texture of the stone made it ideal for tool-making.
• Her flintier resolve showed that she would not back down from the challenge.