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1.
Informal - an utterly foolish or senseless person.

Psychology - a person of the lowest order of mental retardation, having a mental age of less than three years old and an intelligence quotient under 25

Related forms
si·b·al·ism, adjective
tera dimaag toh nahin kharab? kapil sibal kahin ka!

He does not use his head at all.. what a sibal!
by kapilsibalisanidiot December 07, 2011