Vexation of spirit - A phrase which occurs 7 times, and may be otherwise translated, “feeding on wind.” Modern Hebrew grammarians assert that the word rendered “vexation” must be derived from a root signifying “to feed,” “follow,” “strive after.” This being admitted, it remains to choose between two translations:
(1) “striving after wind,” or “windy effort;” adopted by the Septuagint and the majority of modern interpreters; or
(2) feeding on wind. Compare Hosea 12:1 : and similar phrases in Proverbs 15:14; Isaiah 44:20; Psalms 37:3.