1. judicious Sagacious refers to a power of tracing the hidden or recondite by slight indications, as by instinct or intuition; it is not now applied to mere keenness of sense-perception. We do not call a hound Synonyms: sagacious, able, intelligent, perspicacious, sensible, acute, keen, quick of scent, sharp, apt, keen-sighted, quick-scented, sharp-witted, clear-sighted, keen-witted, rational, shrewd, discerning, judicious, sage, wise Antonyms: absurd, futile, obtuse, silly, sottish, undiscerning, dull, ignorant, senseless, simple, stupid, unintelligent, foolish, irrational