long-established
Definitions
Having existed or been in practice for a significant period of time.
Firmly rooted or accepted due to a long history.
Examples
The company is a long-established leader in the automotive industry.
They decided to maintain the long-established tradition of hosting a gala every winter.
Synonyms
deep-rooted time-honored venerable entrenched long-standing traditional historic
Antonyms
new recent nascent fledgling short-lived unestablished novel