premeditated Antonyms

unpremeditated abrupt spontaneous unwitting incidental ad lib off-the-cuff unintentional unintended like a bee in clover like a pig in clover like pigs in clover unplanned rolling in clover unsought up in the air according to pleasure misconsidered offhand involuntary accidental ad libitum automatic autoschediastic casual chance extemporal extemporaneous extemporary extempore fortuitous impromptu improvisatorial improviso impulsive inadvertent indeliberate slapdash about