When trying to explain or justify something, it's important to have the right words to effectively communicate your intentions. Instead of repeating "give reason for" over and over, there are several synonyms to spice up your language. You can "provide evidence for," "justify," "rationalize," or "clarify" your actions or decisions. When asking someone else to provide an explanation, try saying "elucidate" or "enlighten me." "Share the rationale behind" something or "shed some light on" a situation are also useful ways to encourage others to give reason for their actions. Choosing the right synonym can give your language a sophisticated edge and make your point clear and concise.