Bunged up usually refers to a person's nasal passage being congested or obstructed, making it difficult to breathe properly. The antonyms for bunged up would be terms that denote a clear and unobstructed airway. Some antonyms for bunged up include open, unblocked, unclogged, clear, and free-flowing. These words indicate that there is no blockage or hindrance to the flow of air through the nostrils, making it easier to breathe. Other possible antonyms for bunged up could include terms that signify the opposite of congestion, such as unimpeded or uninhibited. These antonyms for bunged up are helpful in describing healthy respiratory function and proper airflow.