Noah Webster's Dictionary (a.) Not producing the proper effect; without effect; inefficient; weak; useless; futile; unavailing; as, an ineffectual attempt; an ineffectual expedient.

Multi-Version Concordance Ineffectual (1 Occurrence) 1 Corinthians 15:10 But what I am I am by the grace of God, and His grace bestowed upon me did not prove ineffectual. But I labored more strenuously than all the rest--yet it was not I, but God's grace working with me. (WEY)