- grown within, inward, or into; esp., grown into the flesh: said as of a toenail that curves under at the sides
- inborn; native; innate
- Grown abnormally into the flesh: an ingrown toenail.
- Innate or inveterate: ingrown habits.
- Having the attention focused inward; having little exchange with others; insular: “the small, ingrown world of lower Manhattan” (Forbes).