capricious Play adjectiveGiven to sudden and unaccountable changes of mood or behaviour. SYNONYMS arbitrarychancechangeableerraticfaddishfancifulficklefitfulflightyfreakishhaphazardimpulsiveinconsistentinconstantirregularmercurialquirkyrandomtemperamentalungovernableunpredictableunstablevacillatingvariablevolatilewaywardwhimsicalwild