(a.) Too eager; too impatient.

accident-prone at fever pitch breakneck careless delirious desperate devil-may-care fanatical febrile feverish frantic frenetic frenzied furious harum-scarum hasty headlong hectic hotheaded hurried hysteric impetuous infatuated insane mad overanxious overdesirous overenthusiastic overzealous perfervid precipitant precipitate precipitous reckless slap-bang slapdash ultrazealous wanton wild