Dissuade

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late 15th century (in the sense ‘advise against’): from Latin dissuadere, from dis- (expressing reversal) + suadere ‘advise, persuade’.

wiktionary

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From Middle French dissuader, from Latin dissuādeō(“I urge differently”, “I advise against”, “I dissuade”), from dis-(“away from”, “asunder”) + suādeō(“I recommend”, “I advise”, “I urge”).

etymonline

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dissuade (v.)

1510s, from French dissuader and directly from Latin dissuadere "to advise against, oppose by argument," from dis- "off, against" (see dis-) + suadere "to urge, incite, promote, advise, persuade," literally "recommend as good" (related to suavis "sweet"), from PIE root *swād- "sweet, pleasant" (see sweet (adj.)).. Related: Dissuaded; dissuading.