"to make haste, to be zealous," and hence, "to be diligent," is rendered "endeavoring" in Eph 4:3, AV; RV, "giving diligence." In 2Pe 1:15, AV, "endeavor," RV, "give diligence." Both have "endeavored" in 1Th 2:17. See DILIGENCE.
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"to seek after," is translated "endeavor" in Act 16:10, AV, RV, "sought." See ABOUT (to be), DESIRE, INQUIRE, SEEK.