Antonyms of adj immemorial

1 sense of immemorial

Sense 1
immemorial (postnominal) -- (long past; beyond the limits of memory or tradition or recorded history; "time immemorial")

INDIRECT (VIA old) -> new -- (not of long duration; having just (or relatively recently) come into being or been made or acquired or discovered; "a new law"; "new cars"; "a new comet"; "a new friend"; "a new year"; "the New World")

Similarity of adj immemorial

1 sense of immemorial

Sense 1
immemorial (postnominal) -- (long past; beyond the limits of memory or tradition or recorded history; "time immemorial")
       => old (vs. new) -- (of long duration; not new; "old tradition"; "old house"; "old wine"; "old country"; "old friendships"; "old money")