SYN: Extend, project, impinge, approximate.
ANT: Recurve, retreat, diverge, return, recede.
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KEY: Abyss.
SYN: Gulf, profound, gorge, deep, pit, chasm, depth.
ANT: Surface, cavity, depression, indentation.
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KEY: Academical.
SYN: Collegiate, classical, learned.
ANT: Illiterate, uncollegiate.