extemporize

to perform, make, or do without preparation a good talk show host has to be able to extemporize the interviews when things don't go as planned Synonyms ad-lib, clap (together or up), improvise, fakeRelated Words concoct, contrive, cook (up), devise, fabricate, hatch, invent, make up, manufacture, think (up); cobble (together or up), dash (off)Near Antonyms arrange, lay, prepare, ready; consider, contemplate, ponder, study; exercise, practice (also practise), rehearse