Ressentiment (pronounced /rɛsɑ̃timɑ̃/) is a term used in psychology and philosophy derived from the French word 'ressentiment' (meaning 'resentment': fr. Latin intensive prefix 're', and 'sentire' "to feel").
Ressentiment is a sense of resentment and hostility directed at that which one identifies as the cause of one's frustration, an assignation of blame for one's frustration. The sense of weakness or inferiority and perhaps jealousy in the face of the "cause" generates a rejecting/justifying value system, or morality, which attacks or denies the perceived source of one's frustration. The ego creates an enemy, to insulate itself from culpability.
