[the final syllable is nasal]
noun: A feeling of resentment and hostility accompanied by the lack of means to express or act upon it.
From French ressentiment, from ressentir (to feel strongly), from sentir, from Latin sentire (to feel). Ultimately from the Indo-European root sent- (to head for or to go), that is also the source for send, scent, sense, sentence, assent, and consent.
"It is fair enough to say that the Cmmdr is a representative pedestrian performer seething with ressentiment."
Robert Alter; The Tunnel; The New Republic (Washington, DC); Mar 27, 1995.