a bit previous ad lib ad-lib advanced automatic casual caught napping caught off balance caught short coincidental extemporaneous extemporary extempore extemporized far ahead forward gut half-baked half-cocked haphazard hasty ill-advised ill-considered ill-devised impromptu improvised impulsive inadvertent indeliberate involuntary last-minute makeshift natural not firm off the cuff offhand overhasty oversoon precipitate precocious premature previous reflex reflexive rough-and-ready rushed snap spontaneous spur-of-the-moment surprised taken aback taken by surprise taken unawares too early too soon tripped up unadvised unarranged unbegun uncalculated unconcocted unconscious unconsidered uncontrived uncrystallized undeliberate undeliberated undesigned undevised unguarded unguided unhatched unintended unintentional unjelled unmade unmanufactured unmatured unmeant unmeditated unorganized unplanned unprepared unprimed unprompted unpurposed unready unripe unstudied unthinking unthought unthought-of untimely unwilled unwitting