incogitant

adjective

in·​cog·​i·​tant in-ˈkä-jə-tənt 

: thoughtless, inconsiderate

incogitant litterbugs

Word History

Etymology

Latin incogitant-, incogitans, from in- + cogitant-, cogitans, present participle of cogitare to cogitate

First Known Use

1628, in the meaning defined above