اد1 أَدَّتَّةُ دَاهِيَةٌ, aor. ـُ (T, S; M, K) and اَدِّ, (M, K,) but this latter is strange, [anomalous,] and unknown, (TA,) and اَدَّ, (M, K,) mentioned by Lh, whence it seems that he made the pret. to be of the measure فَعِلَ, or that it is co-ordinate to أَبَى, aor. ـْ (M,) inf. n. أَدُّ, (T, S, M,) A calamity befell him. (M, K.) And in like manner, أَدَّهُ أَمْرٌ, aor.  and inf. n. as above, An event befell him: (M:) or oppressed him, distressed him, or afflicted him. (Bd in xix. 91.) A2: See also 5.5 تأدّد; (T, K;) and ↓ أَدَّ, inf. n. أَدُّ; (TA;) i. q. تَشَدَّدَ [He acted, or behaved, with forced hardness, firmness, strength, vigour, &c.]. (T, K.) أَدُّ (S, M, K) and ↓ إِدُّ (T, K) and ↓ آدُّ (K) Strength; power; force: (S, M, K:) superior power or force or influence; mastery; conquest; predominance. (M, K, TA.) b2:  See also إِدُّ, in two places. b3:  Also, the first, The sound of treading. (T.) إِدُّ: see أَدُّ. b2:  Also, and ↓ إِدَّةٌ, A wonder, or wonderful thing: (M, L, K:) a very evil, abominable, severe, thing, or affair: (S, M, A, L, K:) a calamity; (S, A, L, K,) or thus the former word signifies; (M;) as also ↓ أَدُّ, (as in the copies of the K,) or ↓ آدُّ, [originally آدِدً] of the measure فَاعِلْ: (so in the S and L:) pl. (of إِدُّ M, TA) إِدادُ (K, TA,) or أَدَادُ (T, CK, [but this, if correct, is a quasi-pl. n.,]) or آدَادُ (M,) and (of إِدَّةٌ, S, M) إِدَدٌ (T, S, M, K.) You say also أَمْرْإِدُّ [meaning as above], using إِدُّ as an epithet, accord. to Lh. (M.) And ↓ دَاهِيَةٌ إِدَّةٌ [A very evil, abominable, or severe, calamity]. (A.) Hence the saying in the Kur [xix. 91], لَقَدْ جِئْتُمْ شَيْئًا إِدًّا Verily ye have done a very evil, or abominable, thing: (S, M: *) or, accord. to one reading, ↓ أَدُّا; both meaning great, or grievous: and some of the Arabs say, ↓ بِشَىْءٍ آدٍّ, which means the same. (T, TA.) إِدَّةٌ: see إِدُّ in two places.آدُّ: see أَدُّ: b2:  and see إِدُّ in two places.