辟易
へきえき · hekieki · JLPT N1 · noun
being frightened
辟 = avoid + 易 = change (of face colour): you recoil in fright, face blanching
From the Shiji: soldiers so terrified of a fierce general that they shrank back and their faces changed. Here 易 means change, not easy, so hekieki is 'avoid and change countenance'.