be malicious, be aggressive, be unfriendly

, (T, S, Msb, TA,) aor. , inf. n. شَكَسٌ (T, Msb, TA) and شَكَاسَةٌ; (T, S, Msb, TA;) or شَكُسَ, aor. , (O, K, TA,) inf. n. شَكَاسَةٌ; (O;) He was, or became, refractory, untractable, perverse, stubborn, or obstinate, in disposition: (S, O, K:) or hard in disposition, or illnatured, in behaviour or dealing: (TA:)or evil in disposition, or illnatured, and very perverse or cross or repugnant and averse; syn. شَرِسَ. (Msb, TA. *)

He treated him, or behaved towards him, with hardness, harshness, or illnature. (O, K.)

They treated, or behaved towards, one another with hardness, harshness, or illnature; or disagreed, one with another; in buying or selling: (IDrd, O, TA:) or they treated, or behaved towards, one another with contrariety, or opposition. (K, * TA.) [Hence,] اللَّيْلُ وَالنَّهَارُ يَتَشَاكَسَانِ (tropical:) The night and the day are opposed to each other: (TA:) or alternate. (Az, A, O, TA.)

: see شَكِسٌ. ― -b2- مَحَلَّةٌ شَكْسٌ (assumed tropical:) A strait place of alighting or abode. (TA.) -A2- الشَّكْسُ A day, or two days, before the new moon; i. q. المُحَاقُ. (AA, O, K.)

: see the next following paragraph.

: see the next following paragraph.

, (Fr, S, Msb, K,) or ↓ شَكْسٌ, (S,) and ↓ شَكُسٌ, (K,) the first agreeable with analogy, (S,) A man (S) refractory, untractable, perverse, stubborn, or obstinate, in disposition: (S, K:) or hard in disposition, or illnatured: (TA:) or evil in disposition, or illnatured, and very perverse or cross or repugnant and averse; syn. شَرِسٌ: (Msb:) and ↓ شِكْسٌ and ↓ مِشْكَسٌ are likewise epithets applied [in the same sense, but the latter having an intensive signification,] to a man: (IAar, TA:) pl. شُكْسٌ; (S, K;) a pl. of the first or third; (K;) or of the second, like as صُدْقٌ is pl. of صَدْقٌ. (S.) ― -b2- Also the first, (tropical:) Niggardly; tenacious; avaricious. (K.)

: see the next preceding paragraph.

(Kur xxxix. 30) Disagreeing, one with another; (A, * K, * TA;) and behaving with hardness, harshness, or illnature: (A:) or disputing, or contending, together. (TA.) [See the verb, 6.]