Geez

ˀənbala - without, save; before; except for; but, rather; outside of, besides, apart from regardless of (CDG 27)

The second element probably goes back to *bVl(Vy). See CDG 27 for discussion.

PS
*bVl(Vy) - without (Kogan 2015: 184)
The PCS negative particle *bal is likely related to this preposition (Arakelova 2001:25, Kogan 2015:184). There is also a possibility that *bVl(Vy) ‘without’ is ultimately connected to the PS root *bly ‘to be worn out’ (GAG § 114 r, Tropper 2000:771, Kogan 2015:184), although this is not generally accepted (Arakelova 2001:25, Pat-El 2013).