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Synonyms: empty, void, unfilled, vacant, unoccupied
Antonym: solid
Synonyms: concave, depressed, sunken, indented, cavernous
Antonym: convex
Synonyms: resonating, echoing, deep, dull, muffled, muted, dead, heavy, reverberating, reverberant, resounding, low
Antonym: high-pitched
Synonyms: worthless, empty, insincere, futile, false, insignificant, vain, unconvincing, cynical, meaningless
Antonym: sincere
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