Synonyms and related words :
abiding, accordant, adherent, adhesive, age-long, aged, alike, ancient, antique, archaic, assiduous, automatic, balanced, beaten, booming, bound, bound and determined, bulldogged, bulldoggish, bulldoggy, bullheaded, changeless, chronic, clamant, clamorous, clingy, committed, consistent, consonant, constant, continual, continuing, continuous, correspondent, crying, decided, decisive, dedicated, definite, demanding, determined, devoted, diligent, diuturnal, dogged, draining, durable, earnest, echoic, echoing, enduring, equable, equal, even, evergreen, exacting, exigent, exorbitant, extortionate, faithful, fast, firm, fixed, flat, frequent, frozen, gluey, glutinous, grasping, growling, gummy, habitual, hackneyed, hardy, haunting, homogeneous, immobile, immutable, importunate, inalterable, incessant, indefatigable, indelible, indomitable, industrious, inflexible, insistent, instant, intact, interminable, intransient, invariable, inveterate, invincible, inviolate, lasting, level, lingering, long-lasting, long-lived, long-standing, long-term, longeval, longevous, loud, loyal, macrobiotic, measured, mechanical, methodic, monolithic, nagging, never-tiring, obdurate, obsessive, obstinate, of a piece, of long duration, of long standing, ordered, orderly, patient, patient as Job, perdurable, perduring, perennial, permanent, perpetual, perseverant, persevering, persisting, pertinacious, plodding, plugging, preoccupied, pressing, purposeful, quiescent, rapt, reboant, rebounding, recurrent, recurring, reechoing, regular, relentless, remaining, repercussive, repetitive, resolute, resolved, resounding, reverberant, reverberating, reverberatory, rigid, robotlike, routine, rumbling, sedulous, self-adhesive, sempervirent, serious, sincere, single-minded, sleepless, slogging, smooth, solid, sounding, stable, static, stationary, staunch, staying, steadfast, steady, stereotyped, stickable, sticking, sticky, stubborn, sustained, systematic, tacky, taxing, tenacious, thundering, tireless, torpid, tough, trite, unabating, unaltered, unbroken, unceasing, unchangeable, unchanged, unchanging, unchecked, unconquerable, undamped, undaunted, undestroyed, undeveloped, undeviating, undifferentiated, undiscouraged, undiversified, undrooping, undying, unending, unfading, unfailing, unfaltering, unflagging, unflinching, unforgettable, uniform, unintermitting, uninterrupted, unnodding, unrelaxing, unrelenting, unremitting, unruffled, unshakable, unshifting, unsleeping, unswerving, untiring, unvaried, unvarying, unwavering, unwearied, unwearying, unwinking, urgent, utterly attentive, viscid, vital, weariless, well-trodden, well-worn, wholehearted