AD LIB

adv. spontaneously, on the spur of the moment, without advance preparation

v. extemporize, make up on the spur of the moment, perform without advance preparation

Ad libitum is Latin for "at one's pleasure"; often shortened to 'Ad lib' (as an adjective or adverb), or 'ad-lib' (as a verb or noun). There is a less commonly used synonym, a bene placito.
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Adverb
1. without advance preparation; "he spoke ad lib"
(synonym) ad libitum, spontaneously, impromptu

Noun
1. remark made spontaneously without prior preparation; "his ad-libs got him in trouble with the politicians"
(hypernym) remark, comment
(derivation) improvise, improvize, extemporize, extemporise
Verb
1. perform without preparation; "he extemporized a speech at the wedding"
(synonym) improvise, improvize, extemporize, extemporise
(hypernym) perform, execute, do
Adjective
1. said or done without having been planned or written in advance; "he made a few ad-lib remarks"
(synonym) spontaneous, unwritten
(similar) unscripted
2. 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"
(synonym) extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, unrehearsed
(similar) unprepared

Synonyms and related words:
a beneplacito, a discretion, ad arbitrium, ad libitum, ad-libbing, al piacere, arrangement, at choice, at pleasure, at short notice, at sight, at will, be caught napping, be surprised, be taken unawares, be unprepared, by ear, caught napping, caught off balance, caught short, cook up, dash off, disqualification, do offhand, extemporaneous, extemporaneously, extemporaneousness, extemporarily, extemporariness, extemporary, extempore, extemporization, extemporize, extemporized, fake, go off half-cocked, haphazard, hasty, have no plan, impromptu, improvisate, improvisation, improvisatorial, improvise, improvised, improvision, improviso, incapability, incompetence, jury-rig, jury-rigged, knock off, lack of preparation, lash up, make up, makeshift, measure, nonpreparation, nonpreparedness, off the cuff, off the hip, off-the-cuff, offhand, on sight, out of hand, planlessness, play by ear, playing by ear, precipitate, pro tempore, rough-and-ready, scrap the plan, snap, stopgap, strike off, surprised, taken aback, taken by surprise, taken unawares, temporary arrangement, temporary measure, throw off, throw together, toss off, toss out, tripped up, unarranged, unbegun, unconcocted, uncontrived, undeliberated, undevised, unfitness, unfittedness, unforced, unhatched, unmade, unmanufactured, unorganized, unplanned, unpremeditated, unprepared, unpreparedness, unprimed, unqualification, unqualifiedness, unreadiness, unready, unrehearsed, unstudied, unsuitability, unsuitableness, unsuitedness, vamp, vulnerability, whip up, whomp up, wing it, without coercion
  

ad lib
tính từ cương, ứng, tác phó từ [một cách] cương, [một cách] ứng tác không hạn chế,tùy thích, thoải mái động từ ứng khẩu, cương
(C) 2007 www.TừĐiểnTiếngViệt.net

ad-lib /æd'lib/
nội động từ (thông tục) ứng khẩu, cương ngoại động từ (từ Mỹ,nghĩa Mỹ), (từ lóng) nói thêm, cương thêm (lời không có trong bản kịch); hát thêm, chơi thêm (nhạc không có trong bản nhạc)
(C) 2007 www.TừĐiểnTiếngViệt.net