אָוֶן ʼâven (H205)

strictly nothingness; also trouble. vanity, wickedness; specifically an idol

1) trouble, wickedness, sorrow 1a) trouble, sorrow 1b) idolatry 1c) trouble of iniquity, wickedness

from an unused root perhaps meaning properly, to pant (hence, to exert oneself, usually in vain; to come to naught);