ريب 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.

• رَابَنِى Form 1

  1 رَابَنِى ذ , (T, S, M, &c.,) aor. يَرِيبُ, (M, Mgh, Msb, K,) inf. n. رَيْبٌ (T, M, Mgh, Msb, &c.) and رِيبَةٌ, (M, K,) or the latter is a simple subst., (S, Msb,) It (a thing) occasioned in me disquiet, disturbance, or…

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• رَيْبٌ

  رَيْبٌ ذ is an inf. n. of 1, (T, M, Mgh, Msb, &c.,) as also , (M, K,) or the latter is a simple subst.: (S, Msb:) the primary signification of the latter [and of the former also when it is used as a simple subst.] is Dis…

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