deep seated

(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"

मैं तो उन्हें ढील दिए जा रहा हूँ। निश्चय ही मेरी चाल अत्यन्त सुदृढ़ है

The cause of his failure is deep-seated.