ad-lib

To improvise and deliver extemporaneously.

To engage in improvisation, as during delivery of a speech.

Words, music, or actions uttered, performed, or carried out extemporaneously.

Uttered, performed, or carried out spontaneously. See synonyms at extemporaneous.

verb

To compose or recite without preparation: extemporize, fake, improvise, make up. Idioms: wing it. See planned/unplanned, prepared/unprepared.

noun

Something improvised: extemporization, impromptu, improvisation. See planned/unplanned, prepared/unprepared.

adjective

Spoken, performed, or composed with little or no preparation or forethought: extemporaneous, extemporary, extempore, impromptu, improvised, offhand, snap, spur-of-the-moment, unrehearsed. Informal off-the-cuff. See prepared/unprepared.

Definition: improvised
Antonyms: deliberate, planned, prepared, rehearsed, written

adv

Definition: improvised
Antonyms: deliberately, planned, prepared, rehearsed, written

v

Definition: improvise speech
Antonyms: plan, prepare, rehearse, write

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at pleasure (ad libitum)