Sentence:  It is a sunny morning in Amman and the three uniformed judges in Jordan's state security court are briskly working their way through a pile of slim grey folders on the bench before them. Each details the charges against 25 or so defendants accused of supporting the fighters of the Islamic State (Isis), now rampaging across Syria and Iraq under their sinister black banners and sending nervous <WSD>jitters</WSD> across the Arab world. 
Meaning of the word marked with <WSD> tags:  A state of nervousness.