Definition of protean adjective from the Oxford Advanced Learner's Dictionary

 

protean

 adjective
adjective
BrE BrE//ˈprəʊtiən//
 
; NAmE NAmE//ˈproʊtiən//
 
; BrE BrE//prəʊˈtiːən//
 
; NAmE NAmE//proʊˈtiən//
 
(literary)
 
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able to change quickly and easily a protean character Word Origin late 16th cent.: from Proteus (a minor sea god in Greek mythology who had the power of prophecy but who changed shapes to avoid answering questions) + -an.
See the Oxford Advanced American Dictionary entry: protean