See ingrained in Webster's New World Roget's A-Z Thesaurus II
adjective
Firmly established by long standing:
confirmed, deep-rooted, deep-seated, entrenched, hard-shell, ineradicable, inveterate, irradicable, set1, settled. See continueForming an essential element, as arising from the basic structure of an individual:
built-in, congenital, connatural, constitutional, elemental, inborn, inbred, indigenous, indwelling, inherent, innate, intrinsic, native, natural. See be, native, start
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