Synonyms of yearlong

1 Syllable

old

2 Syllables

undying, annual, yearly, deathless, constant, chronic, lasting

3 Syllables

durable, ceaseless, perennial, persistent, continuing, sustained, eternal, longstanding, unchanging, unfailing, continual, recurrent, immortal, long-lived, long-lasting, abiding, lifelong, seasonal, permanent, incessant, unceasing

4 Syllables

never-ending, everlasting, perdurable

5 Syllables

inveterate, imperishable, uninterrupted