immemorial
🇺🇸
/ˌɪməˈmɔːriəl/
🇬🇧
/ˌɪməˈmɔːriəl/
existing for so long that no one can remember when it began
The ancient customs of the village have been followed from time immemorial.
这个村庄古老的习俗自古以来就一直在遵循。