שָׁוְא shâvᵉʼ (H7723)

evil (as destructive), literally (ruin) or morally (especially guile); figuratively idolatry (as false, subjective), uselessness (as deceptive, objective; also adverbially, in vain)

1) emptiness, vanity, falsehood 1a) emptiness, nothingness, vanity 1b) emptiness of speech, lying 1c) worthlessness (of conduct)

or שַׁו; from the same as שׁוֹא (H7722) in the sense of desolating;