جَهْلٌ

a verbal noun of 1: Ignorance; opposite of عِلْمٌ: (S, Msb, * K: *) [and silliness, or foolishness: and wrong conduct: (see 1:)] it is of two kinds; namely, simple, which is the non-existence of knowledge of that which should be known; and compound, which is a decisive belief not agreeable with the fact, or reality: so according to Ibn-El-Kemál: or, according to Er-Rághib, it is of three kinds; namely, the mind's voidness of knowledge, which is the primary meaning; and the believing a thing to be different from what it is; and the doing a thing in a manner different from that in which it ought to be done: or, according to El-Harállee, the proceeding in dubious affairs without knowledge. (TA.) It is said in a prov., كَفِى بِالشَّكِّ جُهْلًا [Doubt is sufficient ignorance]. (Msb.) And it is said in a tradition, إِنَّ مِنَ العِلْمِ جَهْلًا [Verily there is, among the kinds of knowledge, what is ignorance]: this is one's learning what is not requisite, and neglecting what is requisite; or a learned man's affecting, or pretending, a knowledge of that which he does not know. (TA.)