endeavor UK /ɪnˈdɛv.ə/US /ɛnˈdɛv.ɚ/verb 4noun 1forms 4 verb4 •To attempt through application of effort (to do something); to try strenuously.She was endeavoring to teach us the elements of a good prose style. •To work with purpose. •(no longer used) To attempt (something). •(no longer used) To exert oneself. noun1 •A sincere attempt; a determined or assiduous effort towards a specific goal; assiduous or persistent activity. formsendeavor'd · endeavored · endeavoring · endeavors