different between unpickable vs unlickable

English

un- +? pickable

unpickable (not comparable)

un- +? lickable

unlickable (comparative more unlickable, superlative most unlickable)

Unable to be licked.
(colloquial) That cannot be defeated or overcome.
- 1963, United States. Congress. Senate. Committee on Labor and Public Welfare. Subcommittee on Employment, Manpower, and Poverty, Nation's Manpower Revolution (volumes 7-9, page 2585)
  We have tried to lick this problem although I think in a way it is unlickable through a variety of devices.

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