detrimental - Dictionary definition and meaning for word detrimental
look at the part MENTAL...a MENTAL person can cause serious harm or injury when violent.
detrimental word is like experimental. wen u are doin the Experiment, then it is obviously harmful to everyone.
De+tri+mental.. person with tri(three) mental(mental states).. a case of split personality.. can be harmful.. (remember ajay devgan in sme movie!?)
the(de)+three(tri)+mental-> three mental damaging and harmful