نجس1 نَجِسَ, aor. ـَ (S, Msb, K;) and نَجَسَ, aor. ـُ (Msb;) and نَجُسَ, aor. ـُ (K,) accord. to some, but the books of good repute are silent respecting this last; (Msb;) inf. n. نَجَسٌ, (S, Msb, TA,) of the first; (Msb;) and نَجَاسَةٌ, (TA,) or this last is a simple subst. [as the verb نَجُسَ to which by rule it should belong is not of good authority]; (Msb;) It was, or became, unclean, dirty, filthy, or impure; (Msb;) [i. e.,] contr. of طَهَرَ, or طَهُرَ: (Msb, K: *) نَجَاسَة is of two kinds; one kind is perceived by sense; and one kind is perceived by the mind; of which latter kind is that which is attributed, in the Kur, ix. 28, to those who assert God to have associates: (Er-Rághib, B:) but in this latter sense, it is said by Z, to be tropical. (TA.) [See also نَجَاسَةٌ below.] You also say, (of a garment, A, Msb,) ↓ تنجّس, meaning, It was, or became, rendered unclean, dirty, filthy, or impure. (A, Msb, K.) A2:  نَجْسٌ, [app. an inf. n. of which the verb is نَجَسَ,] The making a child's عُودَة [or amulet, of any of the kinds described below, voce تَنْجِيسٌ]. (TA.) 2 نجّسهُ, (S, A, Msb, K,) inf. n. تَنْجِيسٌ, (TA,) He rendered him, or it, unclean, dirty, filthy, or impure; (A, Msb, K;) and ↓ انجسهُ signifies the same. (S, A, K.) El-Hasan said of a man who married a woman with whom he had committed fornication, فَهُوَ أَحَقُّ بِهَا ↓ هُوَ أَنْجَسَهَا [He defiled her, therefore he is most worthy of her]. (A, TA. *) b2:  نَجَّسَتْهُ الذُّنُوبُ (tropical:)  [Sins, or crimes, defiled him]. (A, TA.) A2:  نجّس لَهُ, and نجّسهُ, He charmed him; or fortified him by a charm or an amulet [of any of the kinds described below, voce تَنْجِيسٌ, q. v.]; syn. عَوَّذَهُ. (TA.) 4 أَنْجَسَ see 2, in two places.5 تنجّس: see نَجِسَ.A2:  He did a deed whereby to become free from uncleanness, dirt, filth, or impurity; (K;) like as you say تَأَثَّمَ and تَحَرَّجَ and تَحَنَّثَ, meaning, he did a deed whereby to become free from crime, sin, &c. (TA.) نَجْسٌ: see نَجِسٌ.نِجْسٌ: see نَجِسٌ.نَجَسٌ: see نَجِسٌ.نَجُسٌ: see نَجِسٌ.نَجِسٌ and ↓ نَجَسٌ (S, A, O, Msb, K) and ↓ نَجُسٌ and ↓ نَجْسٌ and ↓ نِجْسٌ (A, O, K) Unclean, dirty, filthy, or impure: (A, Msb, K:) the last of these is only used when the word is preceded or followed by رِجْسٌ: (ISd:) or only when it is preceded by رِجْسٌ: (Fr, S, * and Har in the Durrat-el-Ghowwás:) but this remark correctly applies only to the greater number of instances: (M, F:) the second of the above five forms is an inf. n. used as an epithet; (A, Msb;) and is [therefore] used as sing. and dual. and pl. and masc. and fem., without variation: (TA:) [and the first and last are also used as pls., as will be seen below; but when so used, I suppose قَوْمٌ or some other coll. gen. n. to be understood:] the pl. [of every one of the other forms] is أَنْجَاسٌ (A, Msb, TA) and [of the fourth and fifth, and perhaps of the first and third also, though I do not remember similar instances,] نِجْسَةٌ. (TA.) [See also نَجَاسَةٌ, below.] نَجِسٌ and ↓ نَجْسٌ [&c.], applied to a man, signify Unclean, &c., [both properly and tropically]. (TA.) [The two following examples are said in the A to be tropical.] النَّاسُ أَجْنَاسٌ وَأَكْثَرُهُمْ أَنْجَاسٌ (tropical:)  [Men are of several kinds, and most of them are unclean.] (A, TA.) And إِنَّمَا الْمُشْرِكُونَ نَجَسٌ (tropical:)  [Verily the associaters of others with God are but unclean], said in the Kur, [ix. 28,] (S, A, TA,) or نَجِسٌ, or ↓ نِجْسٌ, accord. to certain readers. (TA.) A2: Also, all the above forms, A man having an incurable disease. (TA.) b2:  See also نَاجِسٌ.نُجُسٌ: see مُنَجِّسٌ.نِجَاسٌ: see تَنْجِيسٌ.نَجِيسٌ: see نَاجِسٌ.نَجَاسَةٌ: see 1: Uncleanness, dirtiness, filthiness, or impurity. (Msb.) b2:  In the conventional language of the law, A particular uncleanness, of such a kind as renders prayer invalid; as urine, and blood, and wine. (Msb.) دَآءٌ نَاجِسٌ and ↓ نَجِيسٌ (S, A, K) and ↓ نَجِسٌ (TA) An incurable disease: (S, K, TA:) or a disease that baffles the مُنَجِّسُون. (A.) See مُنَجِّسٌ.أَنْجَسُ [More, and most, unclean, dirty, filthy, or impure]. You say, لَا تَرَى أَنْجَسَ مِنَ الكَافِرِ (tropical:)  [Thou wilt not see any one more unclean than the unbeliever]. (A, TA.) تَنْجِيسٌ The name of a thing, either something unclean, or bones of the dead, or a menstruous rag, which used to be hung upon him for whom there was a fear of the jinn's, or genii's, being attached to him: (K:) or the hanging of some such thing upon such a person, as a child or any other; for they used to say that the jinn would not approach those things: (TA:) or a thing which the Arabs used to do, as an amulet, to drive away thereby the [evil] eye: (S:) ↓ مُنَجِّسَةٌ also is the name of a kind of amulet: (IAar:) and ↓ نِجَاسٌ is syn. with تَعْوِيذٌ; [by which may be meant either that it signifies an amulet, or that it is a quasi-inf. n. of 2; for it is said that] it is app. a subst. from نَجَّسَ لَهُ, or نَجَّسَهُ, as signifying عَوَّذَهُ. (IAar.) See also 2.مُنَجِّسٌ One who hangs, upon him for whom there is fear, unclean things, such as bones of the dead, and the like, to drive away the jinn, or genii; because these beings shun such things; (S, * A, TA;) one who fortifies by charms or amulets [of the kinds above mentioned]; syn, مُعَوِّذٌ: (K:) pl. مُنَجِّسُونَ: (A:) and ↓ نُجُسٌ [a pl. of which the sing. is not mentioned] is syn. with مُعَوِّذُونَ. (IAar.) A2:  Also, A little piece of skin that is put upon the notch [which is the place] of the bow-string. (TA.) مُنَجِّسَةٌ: see تَنْجِيسٌ.