I am not quite sure if the English know this word LACKADAIS | RAY English Learning Center

I am not quite sure if the English know this word

LACKADAISICAL [ˌlæk.əˈdeɪ.zɪ.kəl] showing little enthusiasm and effort:

e.g.

A lackadaisical defence left Arsenal adrift in the second half.

P.S. I am not sure if you will ever use/need this word but it definitely was new to my vocabulary. It is always good to find out something new