Antonyms for "making absurd" would be "making sense," "making logical," "making valid," and "making reasonable." These words imply that a statement, action, or argument is based on facts or evidence and is not illogical or irrational. Other antonyms include "clarifying," "elucidating," and "illuminating," which suggest that something is being explained in a clear and understandable way. Additionally, antonyms could include "validating," "confirming," and "substantiating," which suggest that something is being proven true or accurate. In short, antonyms for "making absurd" imply that something is believable and understandable, rather than illogical or far-fetched.