The term "telling why" refers to the act of explaining the reasons behind a particular action, decision or thought. The antonyms for this phrase include withholding information, keeping silent, hiding one's motives, being evasive, concealing the truth, obfuscating, misleading, confusing, and deceiving. When we avoid telling why, it creates a sense of mystery or uncertainty, which can be both positive and negative. It could lead to misunderstandings, mistrust and lack of transparency, but at times, can also protect personal privacy or protect from unnecessary conflicts. In conclusion, while telling why is essential in many situations, there exist antonyms that serve their purpose when used skillfully.