immemorial
Immemorial (adj) means So old that it goes back further than anyone can remember or record. Example: “The village has followed the same harvest customs since time immemorial.”
How to use immemorial
Learner’s notesIn plain EnglishExtremely old — from a time so far back no one can remember its start.
Fill the gap
Can you complete this real example?
The village has followed the same harvest customs since time _____.
Etymology
From French immemorial, formed from "im-" ("not") plus "memorial."