i 1 r 1 r 1 e 1 s 1 p 3 o 1 n 1 s 1 i 1 b 3 l 1 e 1 n 1 e 1 s 1 s 1
17 letters · 21 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 irresponsible + -ness.
Etymology from Wiktionary, CC BY-SA 3.0