settled or confirmed in a habit, practice, feeling, or the like

an inveterate gambler.

firmly established by long continuance, as a disease, habit, practice, feeling, etc.; chronic.

adjective

short-lived

adjective

abiding , accustomed , addicted , chronic , confirmed , continuing , customary , deep-rooted , deep-seated , dyed-in-the-wool * , enduring , entrenched , fixed , habitual , habituated , hard-core * , hardened , inbred , incorrigible , incurable , indurated , ineradicable , ingrained , innate , lifelong , long-lasting , long-lived , obstinate , old , perennial , permanent , persistent , persisting , set , settled , stubborn , sworn , usual , hard-shell , irradicable , avid , established , inured