مَرْثُوٌّ

, meaning A man weak in intellect, is from الرَّثْيَةُ, [mentioned in article رثى,] and [therefore] by rule should be مَرْثِىٌّ. (M.) And مَرْثُوْءٌ [signifies the same, (see this word, in article رثأ,) and in like manner, according to ISd,] is from الرَّثْيَةُ, irreg., being with ء (M in article رثى.)