The Collaborative International Dictionary of English v.0.48:
Dissuade \Dis*suade"\, v. t. [imp. & p. p. Dissuaded; p. pr. &
vb. n. Dissuading.] [L. dissuadere, dissuasum; dis- +
suadere to advise, persuade: cf. F. dissuader. See
1. To advise or exhort against; to try to persuade (one from
a course). [Obsolescent]
Mr. Burchell, on the contrary, dissuaded her with
great ardor: and I stood neuter. --Goldsmith.
War, therefore, open or concealed, alike
My voice dissuades. --Milton.
2. To divert by persuasion; to turn from a purpose by reasons
or motives; -- with from; as, I could not dissuade him
from his purpose.
I have tried what is possible to dissuade him.