Englishabiding
adjective
his collections reflect his abiding interest in Italy:
enduring, lasting, persisting, long-lasting, lifelong, continuing, remaining, surviving, standing, fixed, durable, everlasting, perpetual, eternal, unending, constant, permanent, stable, unchanging, steadfast, immutable.
▷antonyms short-lived, ephemeral, transitory.
abiding Oxford Dictionary of English