by ear

ad hoc ad-lib automatic autoschediastic casual expedient extemporary extempore fake free immediate impromptu improv improvisatory improviso informal jamming made-up makeshift offhand on impulse on-the-spot snap spontaneous spur-of-the-moment toss off toss out unplanned unpremeditated unprepared unrehearsed unstudied winging it

deliberate planned premeditated prepared rehearsed

ad hoc ad lib at first glance automatic casual expedient extempore free immediate impromptu improv improvisatory improviso informal jamming made-up makeshift off the cuff off the top of head offhand on impulse on-the-spot snap spontaneous spur-of-the-moment taking for ride thought out loud tossed off tossed out unplanned unpremeditated unprepared unstudied winging it

planned prepared read rehearsed written

ad hoc ad-lib automatic autoschediastic casual expedient extemporary extempore fake free immediate impromptu improv improvisatory improvised improviso informal jamming made-up makeshift offhand on impulse on-the-spot snap spontaneous spur-of-the-moment toss off toss out unplanned unpremeditated unprepared unrehearsed unstudied winging it

ad hoc ad-lib automatic autoschediastic casual expedient extemporary extempore fake free immediate impromptu improv improvisatory improvised improviso informal jamming made-up makeshift offhand on impulse on-the-spot snap spontaneous toss off toss out unplanned unpremeditated unprepared unrehearsed unstudied winging it

ad-lib extemporaneously impromptu improv improvised makeshift off the hip off the top of one's head offhand unrehearsed