Synonyms and Antonyms of improvise
to perform, make, or do without preparation <since the award was a complete surprise, I improvised an acceptance speech> Synonyms ad-lib, clap (together or up), extemporize, fake Related 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
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