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KEY: Unctuous.
SYN: Oily, smooth, fawning, flattering, fulsome, sycophantic, complimentary.
ANT: Abrupt, unmannerly, uncomplimentary, sarcastic, cynical, blunt.
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KEY: Undecided.
SYN: Wavering, hesitating, irresolute, undetermined, [See COVER].
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KEY: Undeniable.
SYN: Incontestable, Indisputable, unquestionable, incontrovertible, [See DECIDE], [See CONTROVERTIBLE and INDISPUTABLE].