The term "be suffused" is defined as something that is filled or covered with a certain quality or feature. The antonyms of "be suffused" are "be emptied," "be devoid," "be vacuous," and "be drained." These antonyms refer to the opposite of being filled or covered with something. When one is suffused with joy, they are filled with happiness; the antonym would be drained of joy, which means being devoid of happiness. Similarly, when something is suffused with light, it's filled with brightness, and its antonym "be vacuous" means empty or a lack of bright light. In conclusion, antonyms of "be suffused" are the opposite of being filled or covered with something.