Costive is an adjective that means slow in action or expression.
The Latin word constipare (con stee PAR ay) referred to constipation, the medical condition of being unable to have a bowel movement. As our word of the day evolved its meaning broadened to also refer to being slow in action, regardless of the reason for the slowness.
Kyle’s costive temperament makes her a good judge. A person who is too quick to make decisions has a tendency to make rash moves.