Crossword Dictionary

hyper

hyper - affected with or exhibiting hyperactivity broadly  : more active than is usual or desirable

synonyms

excitable, fiddle-footed, flighty, fluttery, high-strung, hyperactive, hyperexcitable, hyperkinetic, jittery, jumpy, nervous, skittery, skittish, spasmodic, spooky

in a sentence

hyperactive children who are in dire need of a guardian with a firm hand

I get a little hyper when I drink too much coffee.  

she's so hyper that she's the last person you'd want to turn to in an emergency

merriam-webster

etymology

word-forming element meaning "over, above, beyond," and often implying "exceedingly, to excess," from Greek hyper(prep. and adv.) "over, beyond, overmuch, above measure," from PIE root *uper "over."

etymonline.com