The word 'secour' does not exist in the English language, therefore it cannot have antonyms. It is possible that the intended word is 'secours' which is a French noun meaning aid or assistance. In this case, antonyms could include hindrance, obstruction, or impediment. Alternatively, if the word is 'succour', which is an archaic form of 'succor' meaning assistance or support, its antonyms could include abandonment, neglect, or apathy. It is important to use precise vocabulary to avoid ambiguity and confusion in communication.