Antonyms for the phrase "be given due" can vary depending on the intended meaning. If it refers to receiving the proper recognition or credits, the antonyms can include being neglected, ignored, or overlooked. On the other hand, if it means being prescribed or directed, antonyms may include self-chosen, spontaneous, or voluntary actions. Being denied or refused can be another antonym if "be given due" means entitlement or mandate. In summary, the antonyms for "be given due" may differ depending on the context and interpretation of the phrase, but they generally refer to situations where something is not acknowledged, chosen, or granted.