Definition of unresponsible in English:

unresponsible

Pronunciation /(ˌ)ʌnrɪˈspɒnsɪbl/

adjective

  • 1Not responsible or accountable to any other person or thing; unaccountable.

  • 2Originally: that cannot be relied on; unreliable. Later more usually: reckless, imprudent, irresponsible.

Origin

Early 17th century (in an earlier sense). From un- + responsible.