English
hyperreactive
From hyper- + reactive.
A compound of hyper- + reactive
Proto-Indo-European *úp
Proto-Indo-European *upér ‘over, above’
Proto-Hellenic *hupér
Ancient Greek ὑπέρ ‘over’
English hyper-
Today it means
adj Showing a much greater than normal response to a stimulus
Language periods are conventional ranges, not dates for this word.
Etymograph / hyperreactive