ANT: Loosening, unfastening, dissolution, solution, explication, unravelling, dispersion, multitude, crowd, indentation, evenness, smoothness, cavity.
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KEY: Knotty.
SYN: Tough, bard, difficult, complicated.
ANT: Plain, simple, easy, obvious.
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KEY: Know.
SYN: Perceive, understand, comprehend, recognize, apprehend, distinguish, [See PERCEIVE].
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KEY: Knowing.