Synonyms:
- abiding,
- ageless,
- ardent,
- articulated,
- assiduous,
- catenated,
- ceaseless,
- changeless,
- chattering,
- coeternal,
- concatenated,
- connected,
- constant,
- continual,
- continued,
- continuing,
- continuous,
- cyclical,
- dateless,
- diligent,
- direct,
- dogged,
- endless,
- enduring,
- energetic,
- eternal,
- eterne,
- ever-being,
- ever-durable,
- ever-during,
- everlasting,
- everliving,
- faithful,
- featureless,
- fervent,
- gapless,
- hard,
- hardworking,
- immediate,
- immemorial,
- immutable,
- inalterable,
- incessant,
- incommutable,
- inconvertible,
- indefatigable,
- indefeasible,
- indestructible,
- indomitable,
- industrious,
- inert,
- infinite,
- insistent,
- insusceptible of change,
- interminable,
- intransmutable,
- invariable,
- invincible,
- irretrievable,
- irreversible,
- irrevocable,
- joined,
- jointless,
- laborious,
- lasting,
- linked,
- loyal,
- machine gun,
- monotonous,
- never idle,
- never-ceasing,
- never-ending,
- never-tiring,
- noble,
- nonreturnable,
- nonreversible,
- nonstop,
- nonterminating,
- nonterminous,
- obstinate,
- olamic,
- oscillating,
- patient,
- patient as Job,
- perdurable,
- perennial,
- periodic,
- permanent,
- perpetual,
- perseverant,
- persevering,
- persistent,
- persisting,
- pertinacious,
- plodding,
- plugging,
- preoccupied,
- pulsating,
- rapid,
- rapt,
- recurrent,
- regular,
- relentless,
- remaining,
- repeated,
- repetitive,
- resolute,
- reverseless,
- round-the-clock,
- running,
- seamless,
- sedulous,
- sempiternal,
- serried,
- single-minded,
- sleepless,
- slogging,
- smooth,
- stable,
- staccato,
- staying,
- steadfast,
- steady,
- sticking,
- straight,
- strenuous,
- stubborn,
- stuttering,
- sustained,
- tenacious,
- timeless,
- tireless,
- twenty-four-hour,
- unabating,
- unalterable,
- unalterative,
- unaltered,
- unbroken,
- unceasing,
- unchangeable,
- unchanged,
- unchanging,
- unconquerable,
- undaunted,
- undeflectable,
- undeviating,
- undifferentiated,
- undiscouraged,
- undrooping,
- undying,
- unending,
- unfailing,
- unfaltering,
- unflagging,
- unflinching,
- uniform,
- unintermitted,
- unintermittent,
- unintermitting,
- uninterrupted,
- unmodifiable,
- unnodding,
- unrelaxing,
- unrelenting,
- unrelieved,
- unrestorable,
- unreturnable,
- unsleeping,
- unsparing,
- unstopped,
- unsusceptible,
- unswerving,
- untiring,
- unvariable,
- unvarying,
- unwavering,
- unwearied,
- unwearying,
- unwinking,
- utterly attentive,
- vehement,
- vibrating,
- weariless,
- without end,
- zealous