i 1 r 1 r 1 e 1 s 1 p 3 o 1 n 1 s 1 i 1 b 3 i 1 l 1 i 1 t 1 y 4
16 letters · 23 points in Scrabble
Meaning
noun a form of untrustworthiness; the trait of lacking a sense of responsibility and not feeling accountable for your actions
originFrom ir- + responsibility or irresponsible + -ity.
Etymology from Wiktionary, CC BY-SA 3.0