mal‧feas‧ance /mælˈfiːz
əns/ 
 noun [uncountable][
Date: 1600-1700; 
Origin: mal- + feasance 'doing' (16-18 centuries) (from Anglo-French fesance, from Old French faire 'to do')] 
law illegal or dishonest activity 
 [TahlilGaran] Dictionary of Contemporary English ▲