1. 
[syn: deep-rooted, deep-seated, implanted, ingrained, planted]
The Collaborative International Dictionary of English v.0.48:
deep-rooted \deep-rooted\ adj.
   well-established; as, deep-rooted prejudice.
   Syn: deep-seated, fundamental, ingrained.
        [WordNet 1.5]
WordNet (r) 3.0 (2006):
deep-rooted
    adj 1: (used especially of ideas or principles) deeply rooted;
           firmly fixed or held; "deep-rooted prejudice"; "deep-
           seated differences of opinion"; "implanted convictions";
           "ingrained habits of a lifetime"; "a deeply planted need"
           [syn: deep-rooted, deep-seated, implanted,
           ingrained, planted]