per·spi·ca·cious \|pərspə|kāshəs, |pə̄s-, |pəis-\adjective Etymology: Latin perspicac-, perspicax clear-sighted, (from perspicere to see through) + English -ious — more at perspective 1.archaic: clear-sighted, quick-sighted, sharp-sighted 2.: of acute mental vision or discernment : keen 3.substandard: perspicuous Synonyms:see shrewd