Use 'thoughtless' for actions or words that harm without intention, often due to oversight or neglect. Taking the last slice of cake without offering it was thoughtless.
Pro Tip 2/3
Not Malicious
'Thoughtless' suggests a lack of consideration, not necessarily an intent to harm or offend. Her thoughtless comment hurt his feelings, though she didn't mean to.
Pro Tip 3/3
Unintended Impact
Thoughtless actions might have unintended consequences, affecting relationships or feelings. He was thoughtless to not thank her, causing unnecessary tension.