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"準備か深慮がほとんどない即興的
例:an impromptu speech 即興のスピーチ
an extemporaneous speech or remark; "a witty impromptu must not sound premeditated"準備なしの演説あるいは発言即席演説
例:a witty impromptu must not sound premeditated ウイットに富んだ即興にしたかったら決して準備した感じを与えてはいけない
without advance preparation; "he spoke ad lib"事前準備なしで即興で
a short musical passage that seems to have been made spontaneously without advance preparation短い楽曲で準備なしに即興的に作られたように聞こえるものアンプロンプチュ