Webster's English Dictionary

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chagrin

1. cha.grin \sh*-'grin\ n [F, fr. chagrin sad] : disquietude or distress of 
   mind caused by humiliation, disappointment, o r failure
2. chagrin \-'grind\ \-'grin-in\ vt or cha.grined;  or cha.grin.ing : to 
   vex acutely by disappointing or humiliating : MORTIFY