Today’s A.Word.A.Day with Anu Garg gives us livelong with the following etymology:
From Old English leof (dear, used as an intensifier) + lang (long). Ultimately from the Indo-European root gleubh- (to tear apart), which is also the source of cleve, glyph, clever, clove (garlic), cleave, dermatoglyphics, lief, and lubricious. Earliest documented use: 1450.
The word’s origin is a surprise (I think that’s the theme this week). It’s funny how the IE root changes from the meaning “to tear apart” to “to come together”.