thoughtless
adj. B2 Upper Intermediate US //ˈθɔtɫəs// UK //θˈɔːtləs// thought·less
adj. not thinking about how your actions might hurt or bother other people. You use this to describe someone who acts without care or consideration.
adj. lacking consideration for the feelings, needs, or safety of others. Often used to describe actions or people that are careless or inconsiderate.
His thoughtless comment made everyone in the room uncomfortable.
Leaving the front door unlocked was a thoughtless act that put the whole family at risk.
The architect's thoughtless design ignored the local community's concerns about noise and traffic, leading to a significant protest from the residents.
From thought + -less.