1. (adj) ad-lib
remark made spontaneously without prior preparation
"his ad-libs got him in trouble with the politicians"
2. (adj) ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
with little or no preparation or forethought
"his ad-lib comments showed poor judgment"; "an extemporaneous piano recital"; "an extemporary lecture"; "an extempore skit"; "an impromptu speech"; "offhand excuses"; "trying to sound offhanded and reassuring"; "an off-the-cuff toast"; "a few unrehearsed comments"
3. (verb) ad-lib, spontaneous, unwritten
said or done without having been planned or written in advance
"he made a few ad-lib remarks"
4. (adverb) improvise, improvize, ad-lib, extemporize, extemporise
perform without preparation
"he extemporized a speech at the wedding"
5. (adverb) ad lib, ad libitum, spontaneously, impromptu
without advance preparation
"he spoke ad lib"
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Definitions of AD LIB 
