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English definition of “base”

base

adjective     /beɪs/ literary
not showing any honour and having no morals : I accused him of having base motives .Morally wrong and evilDishonest basely     /ˈbeɪs.li/ adverb baseness     /ˈbeɪs.nəs/ noun [U]
(Definition of base adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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