The word decrees can be defined as official orders or laws given by a person in authority. Antonyms for the word decrees include annuls, cancels, abrogates, invalidates, revokes, nullifies, and repeals. Annuls denotes to declare invalid, cancel or void. To cancel means to make void, to render null or to withdraw something. Abrogates indicates to repeal or abolish officially. Invalidates means to nullify or to declare as invalid. Revokes means to take away or withdraw. The term nullifies means to make void or to render ineffective. Finally, repeals indicate to withdraw or revoke formally.