Synonyms of long-standing in English:

long-standing


See definition of long-standing

adjective

1‘a long-standing friendship’

SYNONYMS

well established, long-established, established, fixed

time-honoured, time-hallowed

abiding, enduring, long-lived, surviving, persistent, prevailing, durable, perennial

firm, constant, deep-rooted, steady, stable, staunch, long-term

ANTONYMS

new, recent