unskilfulness การใช้

• He is said to have for a long time, suffering great pain, owing to the unskilfulness of the hangman, and was eventually cut down and butchered alive.
• Snatch not eagerly at every advantage offered by his unskilfulness or inattention; but point out to him kindly that by such a move he places or leaves a piece in danger and unsupported; that by another he will put his king in a dangerous situation, & c.