حدس1 حَدَسَ, [aor., app., حَدِسَ and Bٌ,] inf. n. حَدْسٌ, He threw, cast, or shot. (TA.) You say, حَدَسْتُ بِسَهْمٍ I shot an arrow. (S.) And حَدَسْتُهُ بِكَذَا I  threw, cast, or shot, at him with such a thing. (A.) A2:  Hence, حَدْسُ الظَّنِّ The conjecturing without evidence or proof. (TA.) You say, حَدَسَ, (S, A, Msb, K,) aor. ـِ (S, Msb, K) and حَدُسَ, (K,) inf. n. حَدْسٌ, (S, A, Msb, K,) He opined: (S, A, K:) or he formed a confirmed opinion: (Msb:) he formed a surmise, or an opinion; or he spoke conjecturally, or surmising: (S, A, K:) he surmised respecting the meanings of speech or language, (A, K,) and things. (K.) And هُوَ يَحْدِسُ He says a thing according to his opinion. (S, TA.) And بَلَغَنِى عَنْ فُلَانٍ أَمْرٌ وَ أَنَا أَحْدِسُ فِيهِ A thing has been told me of such a one, and I speak of it conjecturally, or surmising. (TA.) and حَدَسْتُ عَلَيْهِ ظَنِّى I formed my opinion of it, not being certain of it; as also نَدَسْتُ. (TA.) and حَدَسَ الكَلَامَ عَلَى عَوَاهِنِهِ He spoke without anything to guide him, and without caution. (TA.) And حَدَسَ الشَّىْءَ He computed by conjecture the quantity, measure, or the like, of the thing. (A.) And قَالَهُ بِالحَدْسِ [generally meaning He said it conjecturally, or surmising: but also meaning] he said it by means of intuition. (A, TA.) [حَدْسٌ is also explained in the A as signifying نَظَرٌ خَافٍ: in the TA نَظَرٌ خَفِىٌّ: both app. meaning An obscure, or an occult, mode of judging of a thing.]b2:  حَدْسٌ is also syn. with قَصْدٌ, (K,) used transitively, (T, K,) [app. signifying The aiming at a thing,] by, or with, whatever thing it be; [app. meaning by any mental operation;] by opinion, or by judgment, or by intelligence or cunning sagacity. (TA.) A3:  حَدَسَ فِى الأَرْضِ, (El-Umawee, Msb,) aor. ـِ (El-Umawee, TA,) inf. n. حَدْسٌ, (S,) He went away, (S, Msb, TA,) or journeyed, (TA,) into, or in, or through, the country, or land, without guidance: (S, Msb, TA:) or simply he went away into, or in, the country, or land; as also عَدَسَ. (El-Umawee, TA.) b2:  [Hence, app., the phrase حَدَسَ فِى صَدْرِى شَىْءٌ, which seems to mean A thing came at random into my mind. See هَجَسَ.] b3:  Also حَدَسَ, inf. n. as above, He went in a right course, or direction: (TA:) or in one regular, uniform, or constant, course: (O, K:) or, accord. to Az, not in one regular, uniform, or constant, course. (TA.) b4: And حَدَسَ فِى السَّيْرِ, (Msb,) inf. n. حَدْسٌ, (K,) He hastened, or was quick, in pace, or in journeying. (Msb, K.) 5 تحدّس الأَخْبَارَ, (S, K,) and عَنِ الأَخْبَارِ, (Az, S, A, K,) He sought to learn the news, or tidings, without others' knowing of him; (Az, S, M, A, K;) as also تندّس عنها, and توّجس: (Az, TA:) or he sought for, or inquired respecting, the news, or tidings, in order to know what others knew not. (A.) حَدَّاسٌ One who opines, or conjectures, much; syn. ظَنَّانٌ. (TA.)