Asankhārika-citta: An Abhidhamma term signifying a 'state of consciousness arisen spontaneously, i. e. without previous deliberation, preparation, or prompting by others; hence: 'unprepared, unprompted'. This term and its counterpart sasankhārikacitta, probably go back to a similar distinction made in the Suttas A. IV, 171; path 184. See Tab. I; examples in Vis.M XIV, 84f.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.