from 1 (as a negative particle) and a variation of 1037;
TDNT - 1:9,2 f
AV - bottomless pit 5, deep 2, bottomless 2; 9
1) bottomless
2) unbounded
3) the abyss
3a) the pit
3b) the immeasurable depth
3c) of Orcus, a very deep gulf or chasm in the lowest parts of the earth used as the common receptacle of the dead and especially as the abode of demons