detestable (adj.)

"abominable, very odious," early 15c., from Old French detestable (14c.) and from Latin detestabilis "execrable, abominable," from 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: Detestably; detestableness.