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Lack of knowledge for which a person is morally responsible. It is culpable ignorance because it could be cleared up if the person used sufficient diligence. One is said to be simply (but culpably) ignorant if one fails to make enough effort to learn what should be known; guilt then depends on one's lack of effort to clear up the ignorance. That person is crassly ignorant when the lack of knowledge is not directly willed but rather due to neglect or laziness; as a result the guilt is somewhat lessened, but in grave matters a person would still be gravely responsible. A person has affected ignorance when one deliberately fosters it in order not to be inhibited in what one wants to do; such ignorance is gravely wrong when it concerns serious matters. (Etym. Latin vincibilis, easily overcome; ignorantia, want of knowledge or information.)
All items in this dictionary are from Fr. John Hardon's Modern Catholic Dictionary, © Eternal Life. Used with permission.