extemporaneously

• On those occasions when he speaks extemporaneously, he still struggles with vocalized pauses - those lengthy "Uhhmmms" and "Errrrrs" - but in general, he can compose articulate sentences and typically does fine work with a prepared speech.But is GRAMMAR, itself, in the tank for Obama?
• He fancied he was guiding with his mistress innumerable bands of intermingled sheep; their conversation was in tender eclogues composed by them both extemporaneously, the attractive surroundings inspiring them with poetry. —  Life, Letters, and Epicurean Philosophy of Ninon de L'Enclos, the Celebrated Beauty of the Seventeenth Century
• When our Lafayette Avenue Church was dedicated—just forty years ago—I urged him to deliver the discourse; but he hesitated to preach extemporaneously, and his sight was so impaired that he could not use a manuscript. —  Recollections of a Long Life
• The video was made, extemporaneously, when Austin ran into a group of anarchic Santas, forcibly hugging government bureaucrats and tourists outside the White House, in Washington DC. —  Electronista | Gadgets for Geeks
• We have noticed previously when Obama speaks on economic matters extemporaneously, the uhs and ers go up dramatically and while the eloquence and even the ability to speak in an understandable way goes down noticeably. —  RedStateEclectic

Allen's Synonyms and Antonyms