Treat all unsolicited e-mails with extremecaution.
Times, Sunday Times (2006)
Advisers said anyone approaching retirement should view such deals with extremecaution.
Times, Sunday Times (2013)
A spokesman said:'This case is a painful reminder that all internet users must use extremecaution when talking to or meeting people they only know via the internet'.
The Sun (2010)
Definition of 'caution'
caution
(kɔːʃən)Explore 'caution' in the dictionary
uncountable noun
Caution is great care which you take in order to avoid possible danger.