ad-lib

- adjective (adj)

Meaning: improvised

Synonyms: extemporaneous extempore extemporized impromptu madeup off-the-cuff spontaneous unprepared unrehearsed

Antonyms: deliberate planned prepared rehearsed written

- adverb (adv)

Meaning: in an improvised manner

Synonyms: extemporaneously extempore impromptu off the cuff off the top of one’s head spontaneously without preparation without rehearsal

Antonyms: deliberately planned prepared rehearsed written

- verb (v)

Meaning: improvise speech

Synonyms: extemporize invent make up speak extemporaneously speak impromptu speak off the cuff