When it comes to taking responsibility for one's actions or tasks, there are several antonyms that convey the opposite sentiment of 'without showing responsibility.' Terms like negligent, unreliable, reckless, undependable, inattentive, and indifferent, all imply a lack of accountability, commitment, and dedication. Additionally, words like careless, reckless, thoughtless, and heedless also denote a disregard for consequences and potential harm. Those who exhibit a lack of responsibility can cause disruptions, damage, and harm to both themselves and others, leading to consequences like lost trust and damaged relationships. Conversely, demonstrating responsibility helps build trust, instills confidence, and fosters success in both personal and professional endeavors.