Strong's #7723: shav' (pronounced shawv)
or shav {shav}; from the same as 7722 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.
Brown-Driver-Briggs Hebrew Lexicon:
ׁ / ׁ
shâv' / shav
1) emptiness, vanity, falsehood
1a) emptiness, nothingness, vanity
1b) emptiness of speech, lying
1c) worthlessness (of conduct)
Part of Speech: noun masculine
Relation: from the same as H7722 in the sense of desolating
Usage:
This word is used 53 times:
Jonah 2:8: "They that observe lying vanities forsake their own mercy."
Zechariah 10:2: "have seen a lie, and have told false dreams; they comfort in vain: therefore"
Malachi 3:14: "Ye have said, It is vain to serve God: and what profit is it that we have kept"