Or shav {shav}; from the same as show' in the sense of desolating; evil (as destructive), literally (ruin) or morally (especially guile); figuratively idolatry (as false, subjective), uselessness (as deceptive, objective; also adverbially, in vain) -- false(-ly), lie, lying, vain, vanity.
see HEBREW show'
H7723. shav
שָׁוְא noun [masculine] emptiness, vanity; — ׳שׁ absolute Exodus 23:1 51t., שָׁו Job 15:31 (Kt); —
1 emptiness, nothingness, vanity: ׳שׁ אָרָם תְּשׁוּעַת Psalm 60:13 vain (is) man's deliverance, = Psalm 108:13; ׳שׁ לָכֶם 127:2 it is vain (useless) for you; 89:48 for (עַל) what nothingness hast thou created man ? compare שׁ ׳יַרְחֵי Job 7:3; שׁ ׳הַבְלֵי Psalm 31:7 (idols) = Jonah 2:9, compare Jeremiah 18:15 + Hosea 5:11 ᵐ5 (for צָו); שׁ ׳מִנְחַת Isaiah 1:13 of ineffective offering to ׳י; לַשּׁ ׳נשׂא (לֹא) Exodus 20:7 (twice in verse) take up name of God in vain (to no good purpose) = Deuteronomy 5:11 (twice in verse), compare Psalm 24:4; 139:20 [ᵑ0 lifted up in vain are thy foes, but read שְׁמֶ֑ךָ for עָרֶיךָ, compare נשׂא 1b (7); al. עָלֶיךָ, see II. עָר]; שׁ ׳היה Hosea 12:12 become nothing (We שׁ ׳עשׂה, and so
3); שׁ ׳ראה Psalm 119:37; adverb ׳לַשּׁ in vain Jeremiah 2:30; 4:30; 6:29; 46:11; ׳שׁ Psalm 127:1 (twice in verse); Malachi 3:14.
2 emptiness of speech, "" lying, כָּזָב וּדְבַר ׳שׁ Proverbs 30:8; שׁ ׳דבּר Psalm 12:3; 41:7; 144:8; 144:11; Isaiah 59:4; Ezekiel 13:8; שׁ ׳אָלוֺת Hosea 10:4 + 12:2 ᵐ5 We and others (for שֹׁד); עִםשֿׁ ׳הָלַךְ Job 31:5 ("" מִרְמָה); שׁ ׳עֵד Deuteronomy 5:17 (= שָֽׁקֶר עֵד Exodus 20:16); compare שׁ ׳שֵׁמַע 23:1 (E); of false (empty) prophecy שׁ ׳חֲזוֺן Ezekiel 12:24, שׁ ׳חָזוּ Lamentations 2:14; see also Ezekiel 13:6-7, 9, 23; Ezekiel 21:34; 22:28; Job 35:13 (or empty complaining, below 1); שׁ ׳קסם Ezekiel 21:28; ׳הַשּׁ חֲלֹמוֺת Zechariah 10:2.
3 of conduct, worthlessness (Buhl below
1, 2); שׁ ׳מְרתי worthless men Psalm 26:4; Job 11:11; worthless motives (in figurative) הַשּׁ ׳חַבְלֵי Isaiah 5:18; שׁ ׳נָפַת 30:28 (i.e. sifting out the worthless; al. sieve of (bringing) disappointment); play on meanings in Job 15:31 (twice in verse), compare DrJob, Psalt. 464.
II. שׁוא (√ of following; probably "" form of שׁאה).