Agonize :: Agonize (v. i.) To writhe with agony; to suffer violent anguish.
Agonize :: Agonize (v. i.) To struggle; to wrestle; to strive desperately.
Agonize :: Agonize (v. t.) To cause to suffer agony; to subject to extreme pain; to torture.
Agonizingly :: Agonizingly (adv.) With extreme anguish or desperate struggles.
Antagonize :: Antagonize (v. t.) To contend with; to oppose actively; to counteract.