The antonyms for the word "re-plying" are not easily identifiable, as it is a compound word consisting of the prefix "re-" and the verb "plying." The prefix "re-" means to do something again, so the opposite would be to do it for the first time, which would be the simple action of "plying." However, the verb "plying" has a few antonyms, such as abstaining, ignoring, or neglecting. These words imply a lack of engagement or response, which is the opposite of "re-plying." Nonetheless, "re-plying" is a unique construction, which makes its antonyms somewhat difficult to define.