1. Unequivocally detestable
   "execrable crimes";
   - abominable, detestable, odious
    
2. Deserving to be execrated
   "her execrable pride";
   - damnable
    
3. Of very poor quality or condition
   "execrable housing conditions in the inner city";
   - deplorable, miserable, woeful, wretched

See also: cursed, curst [archaic], hateful, inferior