ad-lib

v., -libbed, -lib·bing, -libs.

v.tr.
To improvise and deliver extemporaneously.

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

n. (ăd'lĭb')
Words, music, or actions uttered, performed, or carried out extemporaneously.

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

ad-libber ad-lib'ber n.

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.

adj

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)