different between unsely vs unsell

Middle English

From Old English uns?li?, equivalent to un- +? sely.

unsely

Not blessed or happy; wretched; unfortunate.
- Chaucer, Troilus and Criseyde; Book I, lines 34-35:

un- +? sell

unsell (third-person singular simple present unsells, present participle unselling, simple past and past participle unsold)

(transitive) To cause to appear less attractive to consumers or adherents.
- 1983, Thomas C. Kinnear, Kenneth L. Bernhardt, Dynamics of marketing principles: a reader
  At the same time, every effort to unsell something may also be viewed as an effort to sell something else. Those who attempt to unsell cigarette smoking are attempting to sell health...

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