expostulate
Concise Oxford English Dictionary © 2008 Oxford University Press:
expostulate /ɪkˈspɒstjʊleɪt, ɛk-/
▶verb express strong disapproval or disagreement.
– derivatives
expostulation noun,
expostulatory /-lət(ə)ri/ adjective.
expostulation noun,
expostulatory /-lət(ə)ri/ adjective.
– origin C16: from L. expostulat-, expostulare ‘demand’.
'expostulate' also found in these Oxford entries:

