سوأ doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• سَآءَ Form 1

  1 سَآءَ ذ , (Lth, M, Msb, K,) aor. يَسُوْءُ, (Lth, Msb,) inf. n. سَوْءٌ, (Lth, M,) or سَوَآءٌ, like سَحَابٌ, (K,) [but the former is that which is commonly known,] It (a thing, Lth, M) was, or became, evil, bad, abomin…

  View in Lane's Lexicon →

• سوّأ Form 2

  2 سوّأ ذ [He corrupted, or marred]. You say, سَوِّ وَلَا تُسَوِّئْ Rectify thou, and do not corrupt, or mar. (A, TA.) [See also 4.] -b2- سوّأ عَلَيْهِ He said to him أَسَأْتُ [Thou hast done ill]. (M.) You say, سَوَّأْتُ…

  View in Lane's Lexicon →