IPA: /ˈflɪn.tɪ.nəs/
KK: /ˈflɪntɪnəs/
The quality of being hard and unyielding, similar to flint, often used to describe a person's character or demeanor.
Her flintiness made her a tough negotiator in business deals.
Flintiness is formed from "flint" (from Old English *flint*, meaning a hard stone used to produce fire) and the suffix "-iness" (meaning the quality of being). The word "flintiness" refers to the quality of being like flint, particularly in hardness or toughness.
Think of the hard stone 'flint' that creates sparks, and remember that 'flintiness' describes the quality of being hard or tough like flint.