"Ex temporizes" refers to someone who improvises or acts spontaneously in a given situation. Some synonyms for this word include ad-lib, extemporize, improvise, impromptu, spontaneous, unplanned, unscripted, and off-the-cuff. All of these words imply that the speaker or performer is operating without a set plan or structure, and is instead relying on their own wit and expertise to make the best out of the situation at hand. These words can be used to describe a variety of situations, from impromptu speeches or performances to quick thinking in emergency situations. Whatever the case may be, having the ability to ex temporize can be a valuable asset in many different contexts.