a.1.Insincere; deceitful; not sound and true; having a cavity or decayed spot within.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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For example, starting with the hollow-hearted 'Yellow Stuffer' bell pepper, Burpee has spent five years selecting the best plants for uniformity, high yield and a more distinct shape.