Reinstitute means to restore or revive something that was previously in existence. Its antonyms, therefore, would be words that signify the opposite of restoration or revival. Some of the antonyms for reinstitute include abandon, discontinue, forsake, neglect, relinquish, and terminate. When we abandon something, we leave it behind, and it may become extinct. Discontinue suggests an end to a practice or policy due to inefficiency or irrelevance. To forsake something is to abandon it permanently. Neglect implies a lack of care or attention, which can cause something to decline. Relinquish means to give up or surrender something. Finally, to terminate something means to bring it to an end.