Avyākata: Indeterminable - i.e. neither determined as kammically advantageous nor as disadvantageous - are the kammically neutral or inert, i.e. amoral, states of consciousness and mental properties. They are either 1: Mere kamma-results vipāka, as e.g. all the sense perceptions and the mental properties associated therewith, or they are 2: Kammically independent & inert functions kiriya-citta, i.e. neither kammic nor kamma-resultant.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.