rock-dumb
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that of a rock; having the quality or characteristic of being as dumb as a rock.This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.
This entry was last updated on RefTopia from its source on 3/20/2012.