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1. Having a very excitable or nervous temperament; high-strung.
2. Emotionally stimulated or overexcited.
[Short for hyperactive.]
informal overactive; overexcited
[C20: probably independent use of hyper-]
1. very excitable or nervous; overexcited; keyed up.
3. obsessively concerned; fanatical; rabid.
[1970–75; probably independent use of hyper-]
a prefix meaning “excessive,” “undue” ( hypercritical; hypersensitive); “unusual, abnormal” ( hyperactive; hyperinflation), used esp. in terms denoting conditions of the body in which substances or functions are at above-normal levels ( hyperglycemia; hypertension),sometimes as a counterpart to a word formed with hypo-; “greatly exceeding norms” ( hypersonic); “forming an analogue (to the thing named) in space of more than four dimensions” ( hyperspace); “connecting in a nonsequential manner” ( hypertext).Compare super-.