Nephesh is, in hundreds of passages of the Old Testament, translated ‘life’ or ‘soul’. It is clearly something in man (or any other animal) which is necessary to life and with which life is closely bound up.
Onians establishes nephesh as the primary Hebrew term designating the vital principle common to all animal life, functioning simultaneously as biological necessity, conscious selfhood, and the seat of desire.
, The origins of European thought about the body, the mind,, 1988thesis