Added 3 October 2026 deep-seated adjective Categories: Describing WordsObscure Words adjective ! Definition from Wiktionary (CC BY-SA). More about deep-seated at Wordnik → Where our words come from → Physically located at a deep level. a deep-seated tumour Firmly implanted or established in thought or behavior and difficult to change; deeply ingrained. She has a deep-seated belief in the essential goodness of human nature. Origin From deep + seated. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: deep-rootedestablishedingrainedimplantedplantedprofounddeepfar-reachingin-depthlong-standingthoroughgoingwell-established Back to today's word