Irresponsible
Pronunciation : Ir`re*spon"si*ble
Part of Speech : a.
Etymology : [Pref. ir- not + responsible: cf. F. irresponsable.]
Definition : 1. Nor responsible; not liable or able to answer fro consequences; innocent.
2. Not to be trusted; unreliable.
Source : Webster's Unabridged Dictionary, 1913