Definition of hyper in English:

hyper

Syllabification: hy·per
Pronunciation: /ˈhīpər
 
/

adjective

informal
Hyperactive or unusually energetic: eating sugar makes you hyper
More example sentences
  • Whenever his friends or family were around he became extremely energetic and hyper.
  • Next week will see the gates of Unionism come crushing down, be prepared to see the siege mentality go into hyper speed.
  • The long car ride and Red Bulls we had pounded left him hyper and a little crazy.
Synonyms
hyperactive, overactive, active, energetic;
busy, fidgety;
excited, frantic, frenetic, frenzied, adrenalized, feverish
informal keyed-up, fired-up, amped-up, psyched, high-energy, caffeinated, pumped, pumped up, turbocharged

Origin

1940s: abbreviation of hyperactive.

Definition of hyper in: