irresponsible

"Throughout my life, I have always failed."

"The negligent babysitter forgot to lock the back door, leaving the house vulnerable to intruders. "

"The child's disruptive behavior in class was a concern for the teacher. "

"Responsibility is a heavy burden."

"My life lacks excitement."

"It took him only twenty minutes to perform the task."

"Do you need a gift for that special someone?"

"The responsible for the project is Maria. "

"Go easy on him: he is but a child."

"He is a student of life."

"Every man is accountable to God for his conduct."

"I must make this deadline or my boss will kill me!"