Timeless; immortal
Without a date imprinted, assigned, or associated.
Out of one's head; deranged.
Thick-headed.
Having no date—a meeting with a lover or potential lover.
Without a start; immemorial
Lasting forever, or for an indefinitely long time.
Set up to be in effect or have tenure for an unlimited duration.
Continuing; uninterrupted.
Flowering throughout the growing season.