the GNU version of the Collaborative International Dictionary of English
adj. Having an active or vigorous mind.
adj. highly intelligent.
The Century Dictionary and Cyclopedia
Having a good brain; intelligent; sharp-witted; quick of comprehension.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. having or marked by unusual and impressive intelligence
Word Usage
"Remy Bumppo Theatre Company, which specializes in brainy, challenging scripts, is doing a real service to the republic of letters by producing "Night and Day," the most obscure of Tom Stoppard's major plays."