Synonyms for Fretful (same or very similar meaning)
WordNet sense 1 (unable to relax or be still):
antsy, fidgety, itchy, restlessWordNet sense 2 (characterized by unrest or disorder):
unquietWordNet sense 3 (habitually complaining):
querulous, whiny, whiney, whiningWordNet sense 4 (expressing pain or dissatisfaction of resentment):
complaining, complaintiveFrom the ODE community, based on WordNetadd/edit