dissuade
Concise Oxford English Dictionary © 2008 Oxford University Press:
dissuade /dɪˈsweɪd/
▶verb (dissuade someone from) persuade someone not to take (a course of action).
– derivatives
dissuader noun,
dissuasion noun,
dissuasive adjective.
dissuader noun,
dissuasion noun,
dissuasive adjective.
– origin C15 (earlier (ME) as dissuasion): from L. dissuadere, from dis- (expressing reversal) + suadere ‘advise, persuade’.
'dissuade' also found in these Oxford entries:

