long-standing
/ˌlɒŋˈstandɪŋ
/adjective
Having existed or continued for a long time: a long-standing tradition...
- The firm has a long-standing relationship with Morrisons dating back more than 30 years.
- You infuse energy and romance in long-standing relationships and rejuvenate them.
- They fear the change will be too stressful and that long-standing relationships with staff will be shattered.
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