English
hypermutable
From hyper- + mutable.
Proto-Indo-European *úp
Proto-Indo-European *upér ‘over, above’
Proto-Hellenic *hupér
Ancient Greek ὑπέρ ‘over’
English hyper-
Proto-Indo-European *meyth₂- ‘to exchange’
Latin mūtō ‘to change, alter’
Latin mutabilis ‘liable to change’
Old French mutable
Middle English mutable ‘mutable, changeable, variable’
English mutable
Today it means
adj That mutates rapidly
Language periods are conventional ranges, not dates for this word.
Etymograph / hypermutable