Definition of cheapest:
(adj) :
Low or reduced in price.
(adj) :
Of poor quality.
(adj) :
Of little worth.
(adj) :
(informal, chiefly derogatory) Stingy; mean; excessively frugal.
(adj) :
(finance) Trading at a price level which is low relative to historical trends, a similar asset, or (for derivatives) a theoretical value.
(adj) :
(slang, of an action or tactic in a game of skill) Underhanded or unfair.