תֹּהוּ tôhûw (H8414)

a desolation (of surface), i.e. desert; figuratively, a worthless thing; adverbially, in vain

1) formlessness, confusion, unreality, emptiness 1a) formlessness (of primeval earth) 1a1) nothingness, empty space 1b) that which is empty or unreal (of idols) (fig) 1c) wasteland, wilderness (of solitary places) 1d) place of chaos 1e) vanity

from an unused root meaning to lie waste;