premeditated Antonyms

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