ANT: Impossible, unallowable.
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KEY: Feat, [See ACHIEVEMENT].
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KEY: Featly, [See FEAT].
SYN: Neatly, cleverly, dexterously, adroitly.
ANT: Clumsily, hardly, bunglingly.
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KEY: Feature.
SYN: Component, element, characteristic, indication, portion, mark, lineament, sign.