mindlessness

noun

heedlessness/ignorance/lack of concern for consequences of one's actions

Wiktionary

noun

Etymology: Etymology tree English mindless Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English mindlessness From mindless + -ness.

The property of being mindless.
“Near-synonym: thoughtlessness”