careless

not being careful or paying attention to what you are doing

descuidado, negligente, imprudente

• be careless about something

Collocations careless mistake · careless driving

• He was very careless with the money.

  Fue muy descuidado con el dinero.

likely to cause harm or damage because of a lack of care

peligroso, arriesgado, peligrosamente descuidado

• careless action

Collocations careless handling of chemicals · careless use of fire

• The building was destroyed by a careless smoker.

  El edificio fue destruido por un fumador descuidado.