livelong

The story

1. Middle English · inherited fromlive long
2. English todaylivelong

From Middle English live long, leve-long, lefe long (as in Alle the lefe longe daye), equivalent to lief + long. Compare Dutch heel den lieven langen dag (“all the livelong day”), German der liebe lange Tag (“the livelong day”) and German die liebe lange Nacht (“the livelong night”).