What Categorizes As Deliberately Being Sinful
Yes, it means if one knows it is wrong and still commits a sin or crime, he is sinful. The things about which one is doubtful, one needs to know their actual status whether or not they are wrong. If he does something without proper knowledge he is blameworthy. If he is unable to know the status of a thing, he needs to avoid it, however, if he does it, and later he knows it was wrong, it is not treated as a major sin.