"his ad-libs got him in trouble with the politicians"
"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"
"he made a few ad-lib remarks"
"he extemporized a speech at the wedding"
牛津高階第八版
美國韋氏詞典
Dictionary.com
Free Dictionary
維基百科 (自由的百科全書)