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Definition of Rock-dumb
1. Adjective. Of a person so dumb that his or her intelligence is not appreciably distinguishable from that of a rock; having the quality or characteristic of being as dumb as a rock. ¹
¹ Source: wiktionary.com
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1. Adjective. Of a person so dumb that his or her intelligence is not appreciably distinguishable from that of a rock; having the quality or characteristic of being as dumb as a rock. ¹
¹ Source: wiktionary.com