a. [ L. callidus, fr. callere to be thick-skinned, to be hardened, to be practiced, fr. callum, callus, callous skin, callosity, callousness. ] Characterized by cunning or shrewdness; crafty. [ R. ] [ 1913 Webster ]
n. [ L. calliditas. ] Acuteness of discernment; cunningness; shrewdness. [ R. ] [ 1913 Webster ]
Her eagly-eyed callidity. C. Smart. [ 1913 Webster ]