سنر doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• سَنِرَ Form 1

  1 سَنِرَ ذ , aor. سَنَرَ , (TK,) inf. n. سَنَرٌ, (M, K,) He (a man, TK) was, or became, illnatured, or very perverse or cross: (K, TK:) or narrow in disposition. (M.) Hence is derived سِنَّوْرٌ, in the first of the sense…

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