Execrable, damnable, accursed, cursed mean so odious as to deserve cursing or condemning.
In actual use they vary little if any in force and only slightly in implications, although usage to a certain extent limits their applications.
Execrable is applied chiefly to what is bad beyond description. Damnable and accursed are applied most often either to persons, their acts, and their vices or to things that excite righteous indignation and strong condemnation.
Cursed varies in dignity, sometimes being applied to what merely excites profanity and sometimes to what is intrinsically worthy of imprecation.