The word for today is…
mutable (adj) – 1. (a) Capable of or subject to change or alteration.
(b) Prone to frequent change; inconstant: mutable weather patterns.
2. Tending to undergo genetic mutation.
Source : The Free Dictionary
Etymology : Late 14th century, “liable to change,” from Latin mutabilis “changeable,” from mutare “to change,” from PIE root *mei- “to change, go, move” (source also of Sanskrit methati “changes, alternates, joins, meets;” Avestan mitho “perverted, false;” Hittite mutai- “be changed into;” Latin meare “to go, pass,” migrare “to move from one place to another;” Old Church Slavonic mite “alternately;” Czech mijim “to go by, pass by,” Polish mijać “avoid;” Gothic maidjan “to change”); with derivatives referring to the exchange of goods and services as regulated by custom or law.