The word "irresponsible" describes someone who does not show a proper sense of duty or care. An irresponsible person often neglects their obligations or makes careless decisions that can lead to negative consequences. It reflects a lack of accountability or reliability in one's actions.
The word "irresponsible" is formed by the prefix "ir-", which means "not," added to the word "responsible." "Responsible" comes from the Latin word "responsabilis," which derives from "respondere," meaning “to respond” or “to answer.” The term has evolved in English to express the notion of being able to respond to obligations and thus implies a sense of duty.