I. ˌir-i-ˈspän(t)-sə-bəl adjective
Date: 1648
: not responsible: as
a. : not answerable to higher authority
an irresponsible dictatorship
b. : said or done with no sense of responsibility
irresponsible accusations
c. : lacking a sense of responsibility
d. : unable especially mentally or financially to bear responsibility
• ir·re·spon·si·bil·i·ty ˌir-i-ˌspän(t)-sə-ˈbi-lə-tē noun
• ir·re·spon·si·ble·ness ˌir-i-ˈspän(t)-sə-bəl-nəs noun
• ir·re·spon·si·bly -blē adverb
II. noun
Date: 1892
: a person who is irresponsible