—carelessly adverb —carelessness noun [uncountable]THESAURUScareless not paying enough attention to what you are doing, so that you make mistakes, damage things etcI made a few careless mistakes.It was careless of you to leave your purse lying about.

Is carelessly an adverb or adjective?

carelessly adverb (NO ATTENTION)

What type of word is carelessly?

Giving the appearance of carelessness; relaxedly. "The papers were carelessly strewn on the table." Done without care or attention; inattentively.