slight negligence

The robots went about their work with great caution, they knew exactly that the slightest negligence could cause the stiffly frozen body to break.

The negligence need not be extreme; slight negligence created the liability.

The failure of the Midway Operation was caused by slight negligence, but the effects were so tremendous that Japanese Army operations in the Pacific were shaken to their very roots.

If the bailee primarily benefits, such as if you borrow your neighbor's rake to clean your lawn, the bailee must exercise highest care, i.e. is liable for any damages arising from slight negligence.