as one thinks best

extemporize extemporized impromptu improvise improvised

according to pleasure ad libitum as one wishes at will extemporaneous extempore made-up off-the-cuff spontaneous unprepared unrehearsed without restraint

deliberate planned prepared rehearsed written

according to pleasure ad-lib as one wishes at will extemporaneous freely impromptu improvised impulsive made-up off-the-cuff offhand spontaneously unrehearsed without restraint