Unpreparedness is the greatest enemy, let's always be careful not to neglect caution.

He always keeps a smile on his face.

He was neglecting his work.

I'm feeling somewhat sluggish today.

He is neglecting his work.

Please be careful when crossing the road.

Please cross the road with caution.

He is a lazy person, spending the day doing nothing.

His laziness is slowing down the progress of work.

He was paying attention to the teacher's talk during the class.