hard–core

firmly established over time the hard-core habits that generate our mountains of trash everyday will be extremely difficult to change Synonyms bred-in-the-bone, confirmed, deep, deep-rooted, deep-seated, entrenched (also intrenched), hard-core, rooted, settledRelated Words firm, fixed, frozen, hard, hard-and-fast, immutable, irradicable, set, unalterable, unchangeable; embedded (also imbedded), implanted, inculcated, instilled; inborn, inbred, ingrained (also engrained), inherent, innate, integral, intrinsic, natural; accustomed, chronic, customary, habitual, regular, typical, usual; abiding, enduring, lifelong, persistent, persistingNear Antonyms brief, ephemeral, fleeting, impermanent, interim, momentary, provisional, short-lived, short-term, temporary, transient