I. ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: mad (I) + cap
: one who is madcap
II. adjective
: marked by impulsiveness, recklessness, or rashness
the madcap girl ran up to her mother — W.M.Thackeray
the venture was a sound proposition … no madcap haphazard scheme — Irish Digest