1. (adj) ad-lib
remark made spontaneously without prior preparation
Antonyms: scripted, written, prepared
2. (adj) ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
with little or no preparation or forethought
Synonyms: unwritten, unrehearsed, ad-lib, off-the-cuff, extemporaneous, extempore, offhand, spontaneous, extemporary, impromptu, offhanded
Antonyms: prepared, scripted, written
3. (verb) ad-lib, spontaneous, unwritten
said or done without having been planned or written in advance
Synonyms: unwritten, unrehearsed, ad-lib, oral, off-the-cuff, extemporaneous, extempore, self-generated, offhand, spontaneous, extemporary, impromptu, offhanded
Antonyms: written, prepared, scripted
4. (adverb) improvise, improvize, ad-lib, extemporize, extemporise
perform without preparation
Synonyms: ad-lib, improvize, extemporise, improvise, extemporize
Antonyms: written, scripted, prepared
5. (adverb) ad lib, ad libitum, spontaneously, impromptu
without advance preparation
Synonyms: ad libitum, spontaneously, impromptu, ad lib
Antonyms: scripted, prepared, written
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Synonyms and Antonyms of ad lib 
