تجنن 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.

• تَجَنَّنَ Form 5

  5 تَجَنَّنَ see 1, in two places. -b2- تجنّن عَلَيْهِ, and , (S, K,) and , (S,) He feigned himself مَجْنُون [i. e. possessed by a جِنِّىّ, or by جِنّ; and hence generally meaning bereft of reason; or mad, insane, &c.;] t…

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