With اِبْرَنْشَقَ, the subject becomes cheerful. With اِقْشَعَرَّ, the subject experiences a bodily reaction. Neither example needs a direct object to complete its meaning; this is the central feature of an intransitive verb.
By contrast, in بَعْثَرَ الرَّجُلُ الْوَرَقَ, the paper receives the action of scattering. In that usage, بَعْثَرَ is transitive. Transitivity is established by the verb’s actual relation to its object, not by the mere number of radical letters.
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Why the two patterns are treated as intransitive
The Four Unaugmented and Augmented Quadriliteral Patterns
With اِبْرَنْشَقَ, the subject becomes cheerful. With اِقْشَعَرَّ, the subject experiences a bodily reaction. Neither example needs a direct object to complete its meaning; this is the central feature of an intransitive verb.
By contrast, in بَعْثَرَ الرَّجُلُ الْوَرَقَ, the paper receives the action of scattering. In that usage, بَعْثَرَ is transitive. Transitivity is established by the verb’s actual relation to its object, not by the mere number of radical letters.