ADHD /ˌeɪ diː ˌeɪtʃ ˈdiː/adjective 2verb 1noun 1forms 5 adjective2 •[before a noun] Of or relating to attention deficit hyperactivity disorder. •[after a verb] (informal) As of or relating to attention deficit hyperactivity disorder.My brother is ADHD.I'm too ADHD to sit for that long. verb1 •(informal, offensive) To act in a way thought to be characteristic of a person with attention deficit hyperactivity disorder.I had to ADHD my way through my twenties without a diagnosis. noun1 •Initialism of attention deficit hyperactivity disorder. formsADHDed · ADHDing · ADHDs · more ADHD · most ADHD