Definition of hyper
- hyper children
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
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hyper.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use: circa 1942See Words from the same year
: very excited, nervous, or active
: excessively or extremely
: excessive or extreme
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