detest (v.)

1530s, "execrate, hate, dislike intensely," also "to curse, to call God to witness and abhor," from Middle French détester, from Latin detestari "to curse, execrate, abominate, express abhorrence for," literally "denounce with one's testimony," from de "from, down" (see de-) + testari "be a witness," from testis "witness" (see testament). Related: Detested; detesting.