Abrasiveness or an abrasive personality (as in “fingernails on a chalkboard”).
Consider also what stood out about the fingernails and their context.
Your perception of someone’s personality (such as long fingernails representing femininity, or dirty fingernails representing hard work or lack of hygiene).
For a woman, they may remark on her rage. Long fingernails may mention the need to claw through some great obstacle.
A broken fingernail may indicate a loss in the ability to protect your work or a creative project. [2]